diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b25c15b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*~
diff --git a/Changes b/Changes
index 6f9eef6..d29dd06 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,11 @@
+feedgnuplot (1.57) unstable; urgency=medium
+
+  * Added --xticlabels to label the x-axis tics from the data
+  * Added --equation-above and --equation-below to control the equation
+    drawing sequence
+
+ -- Dima Kogan <dkogan@debian.org>  Sun, 21 Feb 2021 13:56:23 -0800
+
 feedgnuplot (1.56) unstable; urgency=medium
 
   * Updated default hardcopy settings
diff --git a/README.pod b/README.pod
index b134c3c..ce3ea97 100644
--- a/README.pod
+++ b/README.pod
@@ -73,10 +73,13 @@ network interface in bytes/second (uses bash, awk and Linux):
 
 =head1 DESCRIPTION
 
-This is a flexible, command-line-oriented frontend to Gnuplot. It creates
-plots from data coming in on STDIN or given in a filename passed on the
-commandline. Various data representations are supported, as is hardcopy
-output and streaming display of live data. A simple example:
+This is a flexible, command-line-oriented frontend to Gnuplot. It creates plots
+from data coming in on STDIN or given in a filename passed on the commandline.
+Various data representations are supported, as is hardcopy output and streaming
+display of live data. For a tutorial and a gallery please see the guide at
+L<https://github.com/dkogan/feedgnuplot/blob/master/guide/guide.org>
+
+A simple example:
 
  $ seq 5 | awk '{print 2*$1, $1*$1}' | feedgnuplot
 
@@ -578,6 +581,18 @@ list
 
 =item
 
+C<--xticlabels>
+
+If given, the x-axis tic labels are not numerical, but are read from the data.
+This changes the interpretation of the input data: with C<--domain>, each line
+begins with C<x label ....>. Without C<--domain>, each line begins with C<label
+...>. This does I<not> affect the tuple size. This makes sense only without
+C<--3d>. Please see the guide
+(L<https://github.com/dkogan/feedgnuplot/blob/master/guide/guide.org>) for usage
+examples.
+
+=item
+
 C<--binwidth width>
 
 The width of bins when making histograms. This setting applies to ALL histograms
@@ -649,7 +664,7 @@ instance, to plot 1% of the data, pass a factor of 100.
 
 =item
 
-C<--everyallID factor>
+C<--everyall factor>
 
 Decimates the input. This works exactly like C<--every>, except it applies to
 I<all> the curves.
@@ -689,6 +704,8 @@ the y-axis extents are not specified (C<--ymin>, C<--ymax>, C<--set 'yrange
 properly. Since this option is just a passthrough to gnuplot, finer control can
 be achieved by passing in C<--equation> and C<--set yrange ...> directly.
 
+=item
+
 C<--equation xxx>
 
 Gnuplot can plot both data and symbolic equations. C<feedgnuplot> generally
@@ -717,6 +734,18 @@ points, and I I<also> plot a true circle as a parametric equation.
 
 =item
 
+C<--equation-below xxx>
+
+Synonym for C<--equation>. These are rendered I<below> all the other data.
+
+=item
+
+C<--equation-above xxx>
+
+Like C<--equation>, but is rendered I<on top> of all the other data.
+
+=item
+
 C<--square>
 
 Plot data with aspect ratio 1. For 3D plots, this controls the aspect ratio for
@@ -893,7 +922,10 @@ also.
 
 C<--geometry>
 
-If using X11, specifies the size, position of the plot window
+Specifies the size, position of the plot window. This applies I<only> to the
+C<x11> gnuplot terminal, and has no effect otherwise. To control the window size
+for any other terminal, ask for the terminal explicitly, with the options
+specifying the size. For instance C<--terminal 'qt size 1024,768'>
 
 =item
 
@@ -905,6 +937,9 @@ Print the version and exit
 
 =head1 RECIPES
 
+For a tutorial and a gallery please see the guide at
+L<https://github.com/dkogan/feedgnuplot/blob/master/guide/guide.org>
+
 =head2 Basic plotting of piped data
 
  $ seq 5 | awk '{print 2*$1, $1*$1}'
@@ -950,7 +985,7 @@ in a Thinkpad.
 
 =head2 Plotting a live histogram of the ping round-trip times for the past 20 seconds
 
- $ ping -A -D 8.8.8.8 |
+ $ ping -D 8.8.8.8 |
    perl -anE 'BEGIN { $| = 1; }
               $F[0] =~ s/[\[\]]//g or next;
               $F[7] =~ s/.*=//g    or next;
@@ -998,7 +1033,7 @@ Dima Kogan, C<< <dima@secretsauce.net> >>
 
 =head1 LICENSE AND COPYRIGHT
 
-Copyright 2011-2012 Dima Kogan.
+Copyright 2011-2021 Dima Kogan.
 
 This program is free software; you can redistribute it and/or modify it
 under the terms of either: the GNU General Public License as published
diff --git a/bin/feedgnuplot b/bin/feedgnuplot
index 3262f71..9af8bd9 100755
--- a/bin/feedgnuplot
+++ b/bin/feedgnuplot
@@ -16,7 +16,7 @@ use Pod::Usage;
 use Time::Piece;
 
 # Makefile.PL assumes this is in ''
-my $VERSION = '1.56';
+my $VERSION = '1.57';
 
 my %options;
 interpretCommandline();
@@ -99,6 +99,8 @@ sub interpretCommandline
   $options{set}        = [];
   $options{unset}      = [];
   $options{equation}   = [];
+  $options{'equation-below'} = [];
+  $options{'equation-above'} = [];
 
   $options{curvestyleall} = '';
   $options{styleall}      = '';
@@ -107,8 +109,11 @@ sub interpretCommandline
   $options{rangesize} = [];
   $options{tuplesize} = [];
 
-  GetOptions(\%options, 'stream:s', 'domain!', 'dataid!', 'vnlog!', '3d!', 'colormap!', 'lines!', 'points!',
-             'circles', 'legend=s{2}', 'autolegend!', 'xlabel=s', 'x2label=s', 'ylabel=s', 'y2label=s', 'zlabel=s',
+  GetOptions(\%options, 'stream:s', 'domain!', 'dataid!', 'vnlog!', 'xticlabels!',
+
+             '3d!', 'colormap!', 'lines!', 'points!', 'circles',
+             'legend=s{2}', 'autolegend!',
+             'xlabel=s', 'x2label=s', 'ylabel=s', 'y2label=s', 'zlabel=s',
              'title=s', 'xlen=f',
              'xmin=s', 'xmax=s', 'x2min=s', 'x2max=s',
              'ymin=f', 'ymax=f', 'y2min=f', 'y2max=f',
@@ -117,7 +122,7 @@ sub interpretCommandline
              'style=s{2}', 'curvestyle=s{2}', 'curvestyleall=s', 'styleall=s', 'with=s', 'extracmds=s@', 'set=s@', 'unset=s@',
              'every=s{2}', 'everyall=s',
              'square!', 'square_xy!', 'square-xy!', 'squarexy!', 'hardcopy=s', 'maxcurves=i', 'monotonic!', 'timefmt=s',
-             'equation=s@',
+             'equation=s@', 'equation-below=s@', 'equation-above=s@',
              'image=s',
              'histogram=s@', 'binwidth=f', 'histstyle=s',
              'terminal=s',
@@ -394,6 +399,12 @@ sub interpretCommandline
       print STDERR "--3d does not make sense with circles (gnuplot doesn't support this)\n";
       exit -1;
     }
+
+    if ( $options{xticlabels} )
+    {
+      print STDERR "--3d makes no sense with --xticlabels\n";
+      exit -1;
+    }
   }
   else
   {
@@ -418,6 +429,12 @@ sub interpretCommandline
       exit -1;
     }
 
+    if ( $options{xticlabels} && @{$options{histogram}})
+    {
+      print STDERR "--histogram makes no sense with --xticlabels\n";
+      exit -1;
+    }
+
     for my $hist_curve(@{$options{histogram}})
     {
         my $hist_dim = getRangeSize($hist_curve);
@@ -500,6 +517,10 @@ sub interpretCommandline
       unshift @{$options{equation}}, qq{"$options{image}" binary filetype=auto flipy with rgbimage title "$options{image}"};
       delete $options{image};
   }
+
+  # --equation-below is a synonym of --equation
+  push @{$options{equation}}, @{$options{'equation-below'}};
+  @{$options{'equation-below'}} = [];
 }
 
 sub getGnuplotVersion
@@ -877,9 +898,6 @@ sub mainThread
     # latest domain variable present in our data
     my $latestX;
 
-    # The domain of the current point
-    my @domain;
-
     # column headers from vnlog
     my @vnlog_headers;
     if($options{vnlog})
@@ -942,14 +960,26 @@ sub mainThread
       }
 
       # parse the incoming data lines. The format is
-      # x id0 dat0 id1 dat1 ....
+      # x xticlabels id0 dat0 id1 dat1 ....
       # where idX is the ID of the curve that datX corresponds to
       #
-      # $options{domain} indicates whether the initial 'x' is given or not (if not, the line
-      # number is used)
-      # $options{dataid} indicates whether idX is given or not (if not, the point order in the
-      # line is used)
-      # 3d plots require $options{domain}, and dictate "x y" for the domain instead of just "x"
+      # - $options{domain} indicates whether the initial 'x' is given or not (if not, the line
+      #   number is used)
+      #
+      # - $options{xticlabels} indicates whether the 'xticlabels' is given or not
+      #
+      # - $options{dataid} indicates whether idX is given or not (if not, the point order in the
+      #   line is used)
+      #
+      # - 3d plots require $options{domain}, and dictate "x y" for the domain instead of just "x"
+
+      # The domain of the current point
+      my @domain;
+
+      # The x-axis tic label for this point. Used only if --xticlabels
+      my $xticlabel = '';
+
+
 
       my @fields = split;
       my $i_column = 0;
@@ -958,7 +988,7 @@ sub mainThread
       {
         if( $options{timefmt} )
         {
-            # no point if doing anything unless I have at least the domain and
+            # no point in doing anything unless I have at least the domain and
             # 1 piece of data
             next if @fields < $options{timefmt_Ncols}+1;
 
@@ -968,7 +998,7 @@ sub mainThread
         }
         elsif(!$options{'3d'})
         {
-            # no point if doing anything unless I have at least the domain and
+            # no point in doing anything unless I have at least the domain and
             # 1 piece of data
             next if @fields < 1+1;
 
@@ -977,7 +1007,7 @@ sub mainThread
         }
         else
         {
-            # no point if doing anything unless I have at least the domain and
+            # no point in doing anything unless I have at least the domain and
             # 1 piece of data
             next if @fields < 2+1;
 
@@ -1006,6 +1036,17 @@ sub mainThread
         $domain0_numeric = $line_number;
       }
 
+      if ($options{xticlabels})
+      {
+          # no point in doing anything unless I have at least the xticlabel
+          # and 1 piece of data
+          next if @fields < 1+1;
+
+          $xticlabel = '"' . (shift @fields) . '"';
+          $i_column += 1;
+      }
+
+
       my $id = -1;
       while(@fields)
       {
@@ -1032,11 +1073,21 @@ sub mainThread
           my $rangesize = getRangeSize($id);
           last if @fields < $rangesize;
 
-          pushPoint(getCurve($id),
-                    join(' ',
-                         @domain,
-                         splice( @fields, 0, $rangesize ) ) . "\n",
-                    $domain0_numeric);
+
+          # Done. The curve is created. I add a point to the plot.
+          my $curve = getCurve($id);
+
+          push @{$curve->{datastring_meta}},
+          { offset_start => length( $curve->{datastring} ) +
+                            $curve->{datastring_offset},
+            domain       => $domain0_numeric };
+          $curve->{datastring} .=
+            join(' ',
+                 @domain,
+                 $xticlabel,
+                 splice( @fields, 0, $rangesize ) ) . "\n";
+          $haveNewData = 1;
+
 
           $i_column += $rangesize;
       }
@@ -1123,7 +1174,8 @@ sub plotStoredData
   my @extraopts = map {$_->{options}} @nonemptyCurves;
 
   my $body = join('', map { "$_," } @{$options{equation}});
-  $body .= join(', ' , map({ "'-' $_" } @extraopts) );
+  $body   .= join(', ' , map({ "'-' $_" } @extraopts) );
+  $body   .= join('', map { ",$_" } @{$options{'equation-above'}});
 
   if($options{'3d'}) { print PIPE "splot $body\n"; }
   else               { print PIPE  "plot $body\n"; }
@@ -1162,12 +1214,25 @@ sub updateCurveOptions
       # columns as 1:2:3..... I need the right number of columns (this is given
       # as 1 + rangesize). I also need to start the range at the first column
       # past the timefmt
-
       my @rest = map {$_ + $options{timefmt_Ncols}} (1..getRangeSize($id));
-
       $usingoptions = "using 1:" . join(':', @rest);
   }
-
+  elsif( $options{xticlabels})
+  {
+      # if no --domain: I ignore the sequential first column, and I do
+      #   3:4...:xticlabels(2)
+      # if --domain: I do NOT ignore the domain, and I do
+      #   1:3:4...:xticlabels(2)
+      my @rest = map {$_ + 2} (1..getRangeSize($id));
+      if ( $options{domain})
+      {
+          $usingoptions = "using 1:" . join(':', @rest) . ":xticlabels(2)";
+      }
+      else
+      {
+          $usingoptions = "using " . join(':', @rest) . ":xticlabels(2)";
+      }
+  }
 
   $curve->{options} = "$curve->{everyoptions} $histoptions $usingoptions $titleoption $curve->{extraoptions}";
 }
@@ -1344,18 +1409,6 @@ sub replot
   }
 }
 
-# function to add a point to the plot. Assumes that the curve indexed by $idx already exists
-sub pushPoint
-{
-  my ($curve, $datastring, $domain0_numeric) = @_;
-
-  push @{$curve->{datastring_meta}}, { offset_start => length( $curve->{datastring} ) + $curve->{datastring_offset},
-                                       domain       => $domain0_numeric };
-  $curve->{datastring} .= $datastring;
-
-  $haveNewData = 1;
-}
-
 
 mainThread();
 
@@ -1429,10 +1482,13 @@ network interface in bytes/second (uses bash, awk and Linux):
 
 =head1 DESCRIPTION
 
-This is a flexible, command-line-oriented frontend to Gnuplot. It creates
-plots from data coming in on STDIN or given in a filename passed on the
-commandline. Various data representations are supported, as is hardcopy
-output and streaming display of live data. A simple example:
+This is a flexible, command-line-oriented frontend to Gnuplot. It creates plots
+from data coming in on STDIN or given in a filename passed on the commandline.
+Various data representations are supported, as is hardcopy output and streaming
+display of live data. For a tutorial and a gallery please see the guide at
+L<https://github.com/dkogan/feedgnuplot/blob/master/guide/guide.org>
+
+A simple example:
 
  $ seq 5 | awk '{print 2*$1, $1*$1}' | feedgnuplot
 
@@ -1934,6 +1990,18 @@ list
 
 =item
 
+C<--xticlabels>
+
+If given, the x-axis tic labels are not numerical, but are read from the data.
+This changes the interpretation of the input data: with C<--domain>, each line
+begins with C<x label ....>. Without C<--domain>, each line begins with C<label
+...>. This does I<not> affect the tuple size. This makes sense only without
+C<--3d>. Please see the guide
+(L<https://github.com/dkogan/feedgnuplot/blob/master/guide/guide.org>) for usage
+examples.
+
+=item
+
 C<--binwidth width>
 
 The width of bins when making histograms. This setting applies to ALL histograms
@@ -2045,6 +2113,8 @@ the y-axis extents are not specified (C<--ymin>, C<--ymax>, C<--set 'yrange
 properly. Since this option is just a passthrough to gnuplot, finer control can
 be achieved by passing in C<--equation> and C<--set yrange ...> directly.
 
+=item
+
 C<--equation xxx>
 
 Gnuplot can plot both data and symbolic equations. C<feedgnuplot> generally
@@ -2073,6 +2143,18 @@ points, and I I<also> plot a true circle as a parametric equation.
 
 =item
 
+C<--equation-below xxx>
+
+Synonym for C<--equation>. These are rendered I<below> all the other data.
+
+=item
+
+C<--equation-above xxx>
+
+Like C<--equation>, but is rendered I<on top> of all the other data.
+
+=item
+
 C<--square>
 
 Plot data with aspect ratio 1. For 3D plots, this controls the aspect ratio for
@@ -2264,6 +2346,9 @@ Print the version and exit
 
 =head1 RECIPES
 
+For a tutorial and a gallery please see the guide at
+L<https://github.com/dkogan/feedgnuplot/blob/master/guide/guide.org>
+
 =head2 Basic plotting of piped data
 
  $ seq 5 | awk '{print 2*$1, $1*$1}'
@@ -2357,7 +2442,7 @@ Dima Kogan, C<< <dima@secretsauce.net> >>
 
 =head1 LICENSE AND COPYRIGHT
 
-Copyright 2011-2012 Dima Kogan.
+Copyright 2011-2021 Dima Kogan.
 
 This program is free software; you can redistribute it and/or modify it
 under the terms of either: the GNU General Public License as published
diff --git a/completions/bash/feedgnuplot b/completions/bash/feedgnuplot
index e11bedf..bbb3b5a 100644
--- a/completions/bash/feedgnuplot
+++ b/completions/bash/feedgnuplot
@@ -25,6 +25,8 @@ complete -W               \
     --set                 \
     --unset               \
     --equation            \
+    --equation-below      \
+    --equation-above      \
     --image               \
     --geometry            \
     --hardcopy            \
@@ -64,4 +66,5 @@ complete -W               \
     --zlabel              \
     --zmax                \
     --zmin                \
+    --xticlabels          \
     --vnlog ' feedgnuplot
diff --git a/completions/zsh/_feedgnuplot b/completions/zsh/_feedgnuplot
index 9d4c87c..53b40c7 100644
--- a/completions/zsh/_feedgnuplot
+++ b/completions/zsh/_feedgnuplot
@@ -39,6 +39,8 @@ _arguments -S
     '*--set[Additional 'set' gnuplot commands]:set-option'                        \
     '*--unset[Additional 'unset' gnuplot commands]:unset-option'                  \
     '*--equation[Raw symbolic equation]:equation'                                 \
+    '*--equation-below[Raw symbolic equation]:equation'                           \
+    '*--equation-above[Raw symbolic equation to plot on top]:equation'            \
     '--image[Image file to render beneath the data]:image:_files -g "(#i)*.(jpg|jpeg|png|gif)"' \
     '--square[Plot data with square aspect ratio]'                                \
     '--square-xy[For 3D plots, set square aspect ratio for ONLY the x,y axes]'    \
@@ -65,4 +67,5 @@ _arguments -S
     '--version'                                                                   \
     '--help'                                                                      \
     '--timefmt[Format for time/date data]:time format'                            \
+    '--xticlabels[x-axis tic labels are read from the data]'                      \
     '--vnlog[column IDs come from a vnlog header]'
diff --git a/guide/.dir-locals.el b/guide/.dir-locals.el
new file mode 100644
index 0000000..3c0e2d2
--- /dev/null
+++ b/guide/.dir-locals.el
@@ -0,0 +1,100 @@
+;; Very similar logic appears in
+;;   https://www.github.com/dkogan/gnuplotlib
+;;   https://www.github.com/dkogan/feedgnuplot
+;; 
+;; I need some advices to be able to generate all the images. I'm not using the org
+;; exporter to produce the html, but relying on github's limited org parser to
+;; display everything. github's parser doesn't do the org export, so I must
+;; pre-generate all the figures with (org-babel-execute-buffer) (C-c C-v C-b).
+
+;; This requires advices to:
+
+;; - Generate unique image filenames
+;; - Communicate those filenames to feedgnuplot
+;; - Display code that produces an interactive plot (so that the readers can
+;;   cut/paste the snippets), but run code that writes to the image that ends up in
+;;   the documentation
+(( org-mode . ((eval .
+  (progn
+            (setq org-confirm-babel-evaluate nil)
+            (org-babel-do-load-languages
+             'org-babel-load-languages
+             '((shell   . t)
+               (gnuplot . t)))
+  ;; This sets a default :file tag, set to a unique filename. I want each demo to
+  ;; produce an image, but I don't care what it is called. I omit the :file tag
+  ;; completely, and this advice takes care of it
+  (defun dima-info-local-get-property
+      (params what)
+    (condition-case nil
+        (cdr (assq what params))
+      (error "")))
+  (defun dima-org-babel-is-feedgnuplot
+      (params)
+    (and
+     (or (not (assq :file params))
+         (string-match "^guide-[0-9]+\\.svg$" (cdr (assq :file params))))
+     (string-match "\\<both\\>" (dima-info-local-get-property params :exports) )
+     (string-match "\\<file\\>" (dima-info-local-get-property params :results ))))
+  (defun dima-org-babel-sh-unique-plot-filename
+      (f &optional arg info params)
+
+    (let ((info-local (or info (org-babel-get-src-block-info t))))
+      (if (and info-local
+               (string= (car info-local) "sh")
+               (dima-org-babel-is-feedgnuplot (caddr info-local)))
+          ;; We're looking at a feedgnuplot block. Add a default :file
+          (funcall f arg info
+                   (cons (cons ':file
+                               (format "guide-%d.svg"
+                                       (condition-case nil
+                                           (setq dima-unique-plot-number (1+ dima-unique-plot-number))
+                                         (error (setq dima-unique-plot-number 0)))))
+                         params))
+        ;; Not feedgnuplot. Just do the normal thing
+        (funcall f arg info params))))
+
+  (unless
+      (advice-member-p
+       #'dima-org-babel-sh-unique-plot-filename
+       #'org-babel-execute-src-block)
+    (advice-add
+     #'org-babel-execute-src-block
+     :around #'dima-org-babel-sh-unique-plot-filename))
+  ;; If I'm regenerating ALL the plots, I start counting the plots from 0
+  (defun dima-reset-unique-plot-number
+      (&rest args)
+      (setq dima-unique-plot-number 0))
+  (unless
+      (advice-member-p
+       #'dima-reset-unique-plot-number
+       #'org-babel-execute-buffer)
+    (advice-add
+     #'org-babel-execute-buffer
+     :before #'dima-reset-unique-plot-number))
+  ;; I'm using github to display guide.org, so I'm not using the "normal" org
+  ;; exporter. I want the demo text to not contain --hardcopy, but clearly I
+  ;; need --hardcopy when generating the plots. I add the --hardcopy to the
+  ;; command before running it
+  (defun dima-org-babel-sh-set-demo-output (f body params)
+    (when (dima-org-babel-is-feedgnuplot params)
+      (with-temp-buffer
+        (insert body)
+        ;; use the local feedgnuplot
+        (beginning-of-buffer)
+        (re-search-forward "\\_<feedgnuplot\\_>")
+        (backward-word-strictly)
+        (insert "../bin/")
+        ;; write to svg
+        (end-of-buffer)
+        (insert (format " --terminal 'svg noenhanced solid size 800,600 font \",14\"' --hardcopy %s" (cdr (assq :file params))))
+        (setq body (buffer-substring-no-properties (point-min) (point-max)))))
+    (funcall f body params))
+  (unless
+      (advice-member-p
+       #'dima-org-babel-sh-set-demo-output
+       #'org-babel-execute:sh)
+    (advice-add
+     #'org-babel-execute:sh
+     :around #'dima-org-babel-sh-set-demo-output))
+  )))))
diff --git a/guide/gnuplot-terminal-test.svg b/guide/gnuplot-terminal-test.svg
new file mode 100644
index 0000000..61c72ab
--- /dev/null
+++ b/guide/gnuplot-terminal-test.svg
@@ -0,0 +1,448 @@
+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="600" height="480"
+ viewBox="0 0 600 480"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
+
+<rect x="0" y="0" width="600" height="480" fill="none"/>
+<defs>
+
+	<circle id='gpDot' r='0.5' stroke-width='0.5' stroke='currentColor'/>
+	<path id='gpPt0' stroke-width='0.222' stroke='currentColor' d='M-1,0 h2 M0,-1 v2'/>
+	<path id='gpPt1' stroke-width='0.222' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
+	<path id='gpPt2' stroke-width='0.222' stroke='currentColor' d='M-1,0 L1,0 M0,-1 L0,1 M-1,-1 L1,1 M-1,1 L1,-1'/>
+	<rect id='gpPt3' stroke-width='0.222' stroke='currentColor' x='-1' y='-1' width='2' height='2'/>
+	<rect id='gpPt4' stroke-width='0.222' stroke='currentColor' fill='currentColor' x='-1' y='-1' width='2' height='2'/>
+	<circle id='gpPt5' stroke-width='0.222' stroke='currentColor' cx='0' cy='0' r='1'/>
+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.222' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
+	<use xlink:href='#gpPt9' id='gpPt10' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt3' id='gpPt11' stroke='currentColor' transform='rotate(45)'/>
+	<use xlink:href='#gpPt11' id='gpPt12' fill='currentColor' stroke='none'/>
+	<path id='gpPt13' stroke-width='0.222' stroke='currentColor' d='M0,1.330 L1.265,0.411 L0.782,-1.067 L-0.782,-1.076 L-1.265,0.411 z'/>
+	<use xlink:href='#gpPt13' id='gpPt14' fill='currentColor' stroke='none'/>
+	<filter id='textbox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
+	</filter>
+	<filter id='greybox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='lightgrey' flood-opacity='1' result='grey'/>
+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
+	</filter>
+</defs>
+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path  d='M0.00,480.00 L599.99,480.00 L599.99,0.01 L0.00,0.01 L0.00,480.00 Z  '/>	<g transform="translate(16.78,21.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="start">
+		<text xml:space="preserve"><tspan font-family="Arial"  xml:space="preserve">svg  terminal test</tspan></text>
+	</g>
+	<g transform="translate(16.78,44.40)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="start">
+		<text xml:space="preserve"><tspan font-family="Arial"  xml:space="preserve">gnuplot version 5.4.1  </tspan></text>
+	</g>
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke-dasharray='2,4'  d='M300.00,480.00 L300.00,0.01 M0.00,240.00 L599.99,240.00  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(300.00,243.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="middle" style='filter:url(#textbox)'>
+		<text><tspan font-family="Arial" >12345678901234567890</tspan></text>
+	</g>
+	<g transform="translate(300.00,243.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="middle">
+		<text><tspan font-family="Arial" >12345678901234567890</tspan></text>
+	</g>
+	<g transform="translate(300.00,216.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="middle">
+		<text><tspan font-family="Arial" >true vs. estimated text dimensions</tspan></text>
+	</g>
+	<path stroke='black'  d='M216.10,231.00 L383.90,231.00 L383.90,249.00 L216.10,249.00 L216.10,231.00 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(300.00,291.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="middle">
+		<text xml:space="preserve"><tspan font-family="Arial"  xml:space="preserve">Enhanced text:   </tspan><tspan font-family="Arial"  xml:space="preserve">x</tspan><tspan font-family="Arial"  font-size="9.6" dy="3.60px" xml:space="preserve">0</tspan><tspan font-family="Arial"  dx="-0.50em" dy="-9.60px" xml:space="preserve">n+1</tspan><tspan font-size="12.0" dy="6.00"></tspan></text>
+	</g>
+	<g transform="translate(300.00,315.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="middle">
+		<text xml:space="preserve"><tspan font-family="Arial"  fill="none" xml:space="preserve">Enhanced text:  </tspan><tspan font-family="Arial"  font-weight="bold"  xml:space="preserve">Bold</tspan><tspan font-family="Arial"  font-style="italic"  xml:space="preserve"> Italic</tspan></text>
+	</g>
+	<g transform="translate(300.00,135.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="start">
+		<text><tspan font-family="Arial" >left justified</tspan></text>
+	</g>
+	<g transform="translate(300.00,153.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="middle">
+		<text><tspan font-family="Arial" >centre+d text</tspan></text>
+	</g>
+	<g transform="translate(300.00,171.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >right justified</tspan></text>
+	</g>
+</g>
+<g fill="none" color="blue" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path  d='M318.00,0.01 L318.00,9.00 M300.00,18.00 L309.00,18.00  '/>	<g transform="translate(291.61,21.90)" stroke="none" fill="blue" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >show ticscale</tspan></text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,21.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >-1</tspan></text>
+	</g>
+	<path stroke='black'  d='M540.66,18.00 L574.22,18.00  '/></g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,39.90)" stroke="none" fill="gray" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >0</tspan></text>
+	</g>
+	<path stroke='gray' stroke-dasharray='2,4'  d='M540.66,36.00 L574.22,36.00  '/>	<use xlink:href='#gpDot' x='587.11' y='36.00' color='gray'/>
+
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,57.90)" stroke="none" fill="rgb(148,0,211)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >1</tspan></text>
+	</g>
+	<path stroke='rgb(148,   0, 211)'  d='M540.66,54.00 L574.22,54.00  '/>	<use xlink:href='#gpPt0' transform='translate(587.11,54.00) scale(4.50)' color='rgb(148,   0, 211)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,75.90)" stroke="none" fill="rgb(0,158,115)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >2</tspan></text>
+	</g>
+	<path stroke='rgb(  0, 158, 115)'  d='M540.66,72.00 L574.22,72.00  '/>	<use xlink:href='#gpPt1' transform='translate(587.11,72.00) scale(4.50)' color='rgb(  0, 158, 115)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,93.90)" stroke="none" fill="rgb(86,180,233)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >3</tspan></text>
+	</g>
+	<path stroke='rgb( 86, 180, 233)'  d='M540.66,90.00 L574.22,90.00  '/>	<use xlink:href='#gpPt2' transform='translate(587.11,90.00) scale(4.50)' color='rgb( 86, 180, 233)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,111.90)" stroke="none" fill="rgb(230,159,0)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >4</tspan></text>
+	</g>
+	<path stroke='rgb(230, 159,   0)'  d='M540.66,108.00 L574.22,108.00  '/>	<use xlink:href='#gpPt3' transform='translate(587.11,108.00) scale(4.50)' color='rgb(230, 159,   0)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,129.90)" stroke="none" fill="rgb(240,228,66)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >5</tspan></text>
+	</g>
+	<path stroke='rgb(240, 228,  66)'  d='M540.66,126.00 L574.22,126.00  '/>	<use xlink:href='#gpPt4' transform='translate(587.11,126.00) scale(4.50)' color='rgb(240, 228,  66)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,147.90)" stroke="none" fill="rgb(0,114,178)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >6</tspan></text>
+	</g>
+	<path stroke='rgb(  0, 114, 178)'  d='M540.66,144.00 L574.22,144.00  '/>	<use xlink:href='#gpPt5' transform='translate(587.11,144.00) scale(4.50)' color='rgb(  0, 114, 178)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,165.90)" stroke="none" fill="rgb(229,30,16)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >7</tspan></text>
+	</g>
+	<path stroke='rgb(229,  30,  16)'  d='M540.66,162.00 L574.22,162.00  '/>	<use xlink:href='#gpPt6' transform='translate(587.11,162.00) scale(4.50)' color='rgb(229,  30,  16)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,183.90)" stroke="none" fill="rgb(0,0,0)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >8</tspan></text>
+	</g>
+	<path stroke='rgb(  0,   0,   0)'  d='M540.66,180.00 L574.22,180.00  '/>	<use xlink:href='#gpPt7' transform='translate(587.11,180.00) scale(4.50)' color='rgb(  0,   0,   0)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,201.90)" stroke="none" fill="rgb(148,0,211)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >9</tspan></text>
+	</g>
+	<path stroke='rgb(148,   0, 211)'  d='M540.66,198.00 L574.22,198.00  '/>	<use xlink:href='#gpPt8' transform='translate(587.11,198.00) scale(4.50)' color='rgb(148,   0, 211)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,219.90)" stroke="none" fill="rgb(0,158,115)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >10</tspan></text>
+	</g>
+	<path stroke='rgb(  0, 158, 115)'  d='M540.66,216.00 L574.22,216.00  '/>	<use xlink:href='#gpPt9' transform='translate(587.11,216.00) scale(4.50)' color='rgb(  0, 158, 115)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,237.90)" stroke="none" fill="rgb(86,180,233)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >11</tspan></text>
+	</g>
+	<path stroke='rgb( 86, 180, 233)'  d='M540.66,234.00 L574.22,234.00  '/>	<use xlink:href='#gpPt10' transform='translate(587.11,234.00) scale(4.50)' color='rgb( 86, 180, 233)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,255.90)" stroke="none" fill="rgb(230,159,0)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >12</tspan></text>
+	</g>
+	<path stroke='rgb(230, 159,   0)'  d='M540.66,252.00 L574.22,252.00  '/>	<use xlink:href='#gpPt11' transform='translate(587.11,252.00) scale(4.50)' color='rgb(230, 159,   0)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,273.90)" stroke="none" fill="rgb(240,228,66)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >13</tspan></text>
+	</g>
+	<path stroke='rgb(240, 228,  66)'  d='M540.66,270.00 L574.22,270.00  '/>	<use xlink:href='#gpPt12' transform='translate(587.11,270.00) scale(4.50)' color='rgb(240, 228,  66)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,291.90)" stroke="none" fill="rgb(0,114,178)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >14</tspan></text>
+	</g>
+	<path stroke='rgb(  0, 114, 178)'  d='M540.66,288.00 L574.22,288.00  '/>	<use xlink:href='#gpPt13' transform='translate(587.11,288.00) scale(4.50)' color='rgb(  0, 114, 178)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,309.90)" stroke="none" fill="rgb(229,30,16)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >15</tspan></text>
+	</g>
+	<path stroke='rgb(229,  30,  16)'  d='M540.66,306.00 L574.22,306.00  '/>	<use xlink:href='#gpPt14' transform='translate(587.11,306.00) scale(4.50)' color='rgb(229,  30,  16)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,327.90)" stroke="none" fill="rgb(0,0,0)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >16</tspan></text>
+	</g>
+	<path stroke='rgb(  0,   0,   0)'  d='M540.66,324.00 L574.22,324.00  '/>	<use xlink:href='#gpPt0' transform='translate(587.11,324.00) scale(4.50)' color='rgb(  0,   0,   0)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,345.90)" stroke="none" fill="rgb(148,0,211)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >17</tspan></text>
+	</g>
+	<path stroke='rgb(148,   0, 211)'  d='M540.66,342.00 L574.22,342.00  '/>	<use xlink:href='#gpPt1' transform='translate(587.11,342.00) scale(4.50)' color='rgb(148,   0, 211)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,363.90)" stroke="none" fill="rgb(0,158,115)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >18</tspan></text>
+	</g>
+	<path stroke='rgb(  0, 158, 115)'  d='M540.66,360.00 L574.22,360.00  '/>	<use xlink:href='#gpPt2' transform='translate(587.11,360.00) scale(4.50)' color='rgb(  0, 158, 115)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,381.90)" stroke="none" fill="rgb(86,180,233)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >19</tspan></text>
+	</g>
+	<path stroke='rgb( 86, 180, 233)'  d='M540.66,378.00 L574.22,378.00  '/>	<use xlink:href='#gpPt3' transform='translate(587.11,378.00) scale(4.50)' color='rgb( 86, 180, 233)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,399.90)" stroke="none" fill="rgb(230,159,0)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >20</tspan></text>
+	</g>
+	<path stroke='rgb(230, 159,   0)'  d='M540.66,396.00 L574.22,396.00  '/>	<use xlink:href='#gpPt4' transform='translate(587.11,396.00) scale(4.50)' color='rgb(230, 159,   0)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,417.90)" stroke="none" fill="rgb(240,228,66)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >21</tspan></text>
+	</g>
+	<path stroke='rgb(240, 228,  66)'  d='M540.66,414.00 L574.22,414.00  '/>	<use xlink:href='#gpPt5' transform='translate(587.11,414.00) scale(4.50)' color='rgb(240, 228,  66)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,435.90)" stroke="none" fill="rgb(0,114,178)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >22</tspan></text>
+	</g>
+	<path stroke='rgb(  0, 114, 178)'  d='M540.66,432.00 L574.22,432.00  '/>	<use xlink:href='#gpPt6' transform='translate(587.11,432.00) scale(4.50)' color='rgb(  0, 114, 178)'/>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(532.27,453.90)" stroke="none" fill="rgb(229,30,16)" font-family="Arial" font-size="12.00"  text-anchor="end">
+		<text><tspan font-family="Arial" >23</tspan></text>
+	</g>
+	<path stroke='rgb(229,  30,  16)'  d='M540.66,450.00 L574.22,450.00  '/>	<use xlink:href='#gpPt7' transform='translate(587.11,450.00) scale(4.50)' color='rgb(229,  30,  16)'/>
+</g>
+<g fill="none" color="red" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g stroke='none' shape-rendering='crispEdges'>
+		<polygon fill = 'currentColor' points = '36.00,194.38 40.65,194.38 36.00,177.00 31.35,194.38 36.00,194.38 '/>
+		<polygon fill = 'currentColor' points = '36.00,285.62 31.35,285.62 36.00,303.00 40.65,285.62 36.00,285.62 '/>
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+		<text xml:space="preserve"><tspan font-family="Arial"  xml:space="preserve">  dt 4</tspan></text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+	<g transform="translate(180.00,368.70)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="start">
+		<text><tspan font-family="Arial" >dashtype</tspan></text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(405.00,396.90)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="middle">
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+		<text><tspan font-family="Arial" > 6</tspan></text>
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+		<text><tspan font-family="Arial" > 8</tspan></text>
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+	<g transform="translate(420.00,46.50)" stroke="none" fill="black" font-family="Arial" font-size="12.00"  text-anchor="middle">
+		<text><tspan font-family="Arial" >filled polygons:</tspan></text>
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diff --git a/guide/guide-1.svg b/guide/guide-1.svg
new file mode 100644
index 0000000..c68c561
--- /dev/null
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+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
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+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
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+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,450.60 L770.62,450.60  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,450.60 L74.13,450.60 M770.62,450.60 L760.12,450.60  '/>	<g transform="translate(53.84,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,396.90 L770.62,396.90  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,396.90 L74.13,396.90 M770.62,396.90 L760.12,396.90  '/>	<g transform="translate(53.84,401.45)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,343.20 L770.62,343.20  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,343.20 L74.13,343.20 M770.62,343.20 L760.12,343.20  '/>	<g transform="translate(53.84,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,289.50 L770.62,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,289.50 L74.13,289.50 M770.62,289.50 L760.12,289.50  '/>	<g transform="translate(53.84,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,235.81 L770.62,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,235.81 L74.13,235.81 M770.62,235.81 L760.12,235.81  '/>	<g transform="translate(53.84,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,182.11 L770.62,182.11  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,182.11 L74.13,182.11 M770.62,182.11 L760.12,182.11  '/>	<g transform="translate(53.84,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,128.41 L770.62,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,128.41 L74.13,128.41 M770.62,128.41 L760.12,128.41  '/>	<g transform="translate(53.84,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,74.71 L770.62,74.71  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,74.71 L74.13,74.71 M770.62,74.71 L760.12,74.71  '/>	<g transform="translate(53.84,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,21.01 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L74.13,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(53.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L63.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L63.63,547.50 M63.63,21.01 L63.63,31.51  '/>	<g transform="translate(63.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M134.33,558.00 L134.33,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M134.33,558.00 L134.33,547.50 M134.33,21.01 L134.33,31.51  '/>	<g transform="translate(134.33,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M205.03,558.00 L205.03,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M205.03,558.00 L205.03,547.50 M205.03,21.01 L205.03,31.51  '/>	<g transform="translate(205.03,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 20</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M275.73,558.00 L275.73,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M275.73,558.00 L275.73,547.50 M275.73,21.01 L275.73,31.51  '/>	<g transform="translate(275.73,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 30</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M346.43,558.00 L346.43,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M346.43,558.00 L346.43,547.50 M346.43,21.01 L346.43,31.51  '/>	<g transform="translate(346.43,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 40</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M417.13,558.00 L417.13,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M417.13,558.00 L417.13,547.50 M417.13,21.01 L417.13,31.51  '/>	<g transform="translate(417.13,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 50</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M487.82,558.00 L487.82,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M487.82,558.00 L487.82,547.50 M487.82,21.01 L487.82,31.51  '/>	<g transform="translate(487.82,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 60</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M558.52,558.00 L558.52,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M558.52,558.00 L558.52,547.50 M558.52,21.01 L558.52,31.51  '/>	<g transform="translate(558.52,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 70</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M629.22,558.00 L629.22,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M629.22,558.00 L629.22,547.50 M629.22,21.01 L629.22,31.51  '/>	<g transform="translate(629.22,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 80</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M699.92,558.00 L699.92,31.51 L699.92,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M699.92,558.00 L699.92,547.50 M699.92,21.01 L699.92,31.51  '/>	<g transform="translate(699.92,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 90</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M770.62,558.00 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M770.62,558.00 L770.62,547.50 M770.62,21.01 L770.62,31.51  '/>	<g transform="translate(770.62,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 100</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L770.62,558.00 L770.62,21.01 L63.63,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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diff --git a/guide/guide-10.svg b/guide/guide-10.svg
new file mode 100644
index 0000000..62e9723
--- /dev/null
+++ b/guide/guide-10.svg
@@ -0,0 +1,603 @@
+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
+
+<rect x="0" y="0" width="800" height="600" fill="none"/>
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+	<circle id='gpDot' r='0.5' stroke-width='0.5' stroke='currentColor'/>
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+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
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+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
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+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
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+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,558.00 L635.10,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,558.00 L108.60,558.00 M635.10,558.00 L624.60,558.00  '/>	<g transform="translate(88.31,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,423.75 L635.10,423.75  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,423.75 L108.60,423.75 M635.10,423.75 L624.60,423.75  '/>	<g transform="translate(88.31,428.30)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,289.50 L635.10,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,289.50 L108.60,289.50 M635.10,289.50 L624.60,289.50  '/>	<g transform="translate(88.31,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,155.26 L635.10,155.26  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,155.26 L108.60,155.26 M635.10,155.26 L624.60,155.26  '/>	<g transform="translate(88.31,159.81)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,21.01 L635.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,21.01 L108.60,21.01 M635.10,21.01 L624.60,21.01  '/>	<g transform="translate(88.31,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
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+</g>
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,558.00 L98.10,547.50 M98.10,21.01 L98.10,31.51  '/>	<g transform="translate(98.10,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
+	</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M232.35,558.00 L232.35,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M232.35,558.00 L232.35,547.50 M232.35,21.01 L232.35,31.51  '/>	<g transform="translate(232.35,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.5</text>
+	</g>
+</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M366.60,558.00 L366.60,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M366.60,558.00 L366.60,547.50 M366.60,21.01 L366.60,31.51  '/>	<g transform="translate(366.60,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
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+</g>
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M500.85,558.00 L500.85,547.50 M500.85,21.01 L500.85,31.51  '/>	<g transform="translate(500.85,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.5</text>
+	</g>
+</g>
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+</g>
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+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M635.10,558.00 L635.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text> 1</text>
+	</g>
+</g>
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+</g>
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+	<path stroke='black'  d='M98.10,21.01 L98.10,558.00 L635.10,558.00 L635.10,21.01 L98.10,21.01 Z  '/></g>
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+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+	<path stroke='black'  d='M648.52,558.00 L675.37,558.00 L675.37,21.01 L648.52,21.01 L648.52,558.00 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M675.37,558.00 L664.87,558.00  '/>	<g transform="translate(685.16,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,558.00 L659.02,558.00 M675.37,490.88 L664.87,490.88  '/>	<g transform="translate(685.16,495.43)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 50</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,490.88 L659.02,490.88 M675.37,423.76 L664.87,423.76  '/>	<g transform="translate(685.16,428.31)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 100</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,423.76 L659.02,423.76 M675.37,356.63 L664.87,356.63  '/>	<g transform="translate(685.16,361.18)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 150</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,356.63 L659.02,356.63 M675.37,289.51 L664.87,289.51  '/>	<g transform="translate(685.16,294.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 200</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,289.51 L659.02,289.51 M675.37,222.39 L664.87,222.39  '/>	<g transform="translate(685.16,226.94)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 250</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,222.39 L659.02,222.39 M675.37,155.26 L664.87,155.26  '/>	<g transform="translate(685.16,159.81)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 300</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,155.26 L659.02,155.26 M675.37,88.14 L664.87,88.14  '/>	<g transform="translate(685.16,92.69)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 350</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,88.14 L659.02,88.14 M675.37,21.01 L664.87,21.01  '/>	<g transform="translate(685.16,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 400</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,21.01 L659.02,21.01  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+</g>
+</svg>
+
diff --git a/guide/guide-11.svg b/guide/guide-11.svg
new file mode 100644
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+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L669.57,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L74.13,558.00 M669.57,558.00 L659.07,558.00  '/>	<g transform="translate(53.84,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
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+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,450.60 L669.57,450.60  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,450.60 L74.13,450.60 M669.57,450.60 L659.07,450.60  '/>	<g transform="translate(53.84,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 20</text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,343.20 L74.13,343.20 M669.57,343.20 L659.07,343.20  '/>	<g transform="translate(53.84,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 40</text>
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,235.81 L669.57,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,235.81 L74.13,235.81 M669.57,235.81 L659.07,235.81  '/>	<g transform="translate(53.84,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 60</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,128.41 L669.57,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,128.41 L74.13,128.41 M669.57,128.41 L659.07,128.41  '/>	<g transform="translate(53.84,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 80</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,21.01 L669.57,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L74.13,21.01 M669.57,21.01 L659.07,21.01  '/>	<g transform="translate(53.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 100</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L63.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L63.63,547.50 M63.63,21.01 L63.63,31.51  '/>	<g transform="translate(63.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M130.96,558.00 L130.96,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M130.96,558.00 L130.96,547.50 M130.96,21.01 L130.96,31.51  '/>	<g transform="translate(130.96,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M198.28,558.00 L198.28,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M198.28,558.00 L198.28,547.50 M198.28,21.01 L198.28,31.51  '/>	<g transform="translate(198.28,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M265.61,558.00 L265.61,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M265.61,558.00 L265.61,547.50 M265.61,21.01 L265.61,31.51  '/>	<g transform="translate(265.61,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 15</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M332.94,558.00 L332.94,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M332.94,558.00 L332.94,547.50 M332.94,21.01 L332.94,31.51  '/>	<g transform="translate(332.94,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 20</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M400.26,558.00 L400.26,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M400.26,558.00 L400.26,547.50 M400.26,21.01 L400.26,31.51  '/>	<g transform="translate(400.26,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 25</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M467.59,558.00 L467.59,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M467.59,558.00 L467.59,547.50 M467.59,21.01 L467.59,31.51  '/>	<g transform="translate(467.59,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 30</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M534.92,558.00 L534.92,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M534.92,558.00 L534.92,547.50 M534.92,21.01 L534.92,31.51  '/>	<g transform="translate(534.92,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 35</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M602.24,558.00 L602.24,31.51 L602.24,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M602.24,558.00 L602.24,547.50 M602.24,21.01 L602.24,31.51  '/>	<g transform="translate(602.24,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 40</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M669.57,558.00 L669.57,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M669.57,558.00 L669.57,547.50 M669.57,21.01 L669.57,31.51  '/>	<g transform="translate(669.57,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 45</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L669.57,558.00 L669.57,21.01 L63.63,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text>-600</text>
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+	<path stroke='black'  d='M684.72,558.00 L695.22,558.00 M715.01,468.51 L704.51,468.51  '/>	<g transform="translate(724.80,473.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text>-400</text>
+	</g>
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+	<path stroke='black'  d='M684.72,468.51 L695.22,468.51 M715.01,379.01 L704.51,379.01  '/>	<g transform="translate(724.80,383.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text>-200</text>
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+		<text> 0</text>
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+		<text> 600</text>
+	</g>
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+	<path stroke='black'  d='M684.72,21.01 L695.22,21.01  '/></g>
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+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M73.42,558.00 L770.62,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M73.42,558.00 L83.92,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(63.63,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M73.42,468.50 L770.62,468.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M73.42,468.50 L83.92,468.50 M770.62,468.50 L760.12,468.50  '/>	<g transform="translate(63.63,473.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 200</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M73.42,379.00 L770.62,379.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M73.42,379.00 L83.92,379.00 M770.62,379.00 L760.12,379.00  '/>	<g transform="translate(63.63,383.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 400</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M73.42,289.50 L770.62,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M73.42,289.50 L83.92,289.50 M770.62,289.50 L760.12,289.50  '/>	<g transform="translate(63.63,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 600</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M73.42,200.01 L770.62,200.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M73.42,200.01 L83.92,200.01 M770.62,200.01 L760.12,200.01  '/>	<g transform="translate(63.63,204.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 800</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M73.42,110.51 L770.62,110.51  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M73.42,110.51 L83.92,110.51 M770.62,110.51 L760.12,110.51  '/>	<g transform="translate(63.63,115.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1000</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M73.42,21.01 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M73.42,21.01 L83.92,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(63.63,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1200</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M73.42,558.00 L73.42,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M73.42,558.00 L73.42,547.50 M73.42,21.01 L73.42,31.51  '/>	<g transform="translate(73.42,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M247.72,558.00 L247.72,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M247.72,558.00 L247.72,547.50 M247.72,21.01 L247.72,31.51  '/>	<g transform="translate(247.72,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M422.02,558.00 L422.02,94.51 M422.02,31.51 L422.02,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M422.02,558.00 L422.02,547.50 M422.02,21.01 L422.02,31.51  '/>	<g transform="translate(422.02,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M596.32,558.00 L596.32,94.51 M596.32,31.51 L596.32,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M596.32,558.00 L596.32,547.50 M596.32,21.01 L596.32,31.51  '/>	<g transform="translate(596.32,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M770.62,558.00 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M770.62,558.00 L770.62,547.50 M770.62,21.01 L770.62,31.51  '/>	<g transform="translate(770.62,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+	<path stroke='black'  d='M73.42,21.01 L73.42,558.00 L770.62,558.00 L770.62,21.01 L73.42,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M270.62,94.51 L270.62,31.51 L760.83,31.51 L760.83,94.51 L270.62,94.51 Z  '/></g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+	<use xlink:href='#gpPt1' transform='translate(526.60,508.78) scale(5.25)' color='rgb(  0, 158, 115)'/>
+	<use xlink:href='#gpPt1' transform='translate(561.46,477.45) scale(5.25)' color='rgb(  0, 158, 115)'/>
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+	<use xlink:href='#gpPt1' transform='translate(631.18,387.95) scale(5.25)' color='rgb(  0, 158, 115)'/>
+	<use xlink:href='#gpPt1' transform='translate(666.04,329.78) scale(5.25)' color='rgb(  0, 158, 115)'/>
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+	<g id="gnuplot_plot_3" ><title>gnuplot_plot_3</title>
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+	<use xlink:href='#gpPt2' transform='translate(73.42,423.75) scale(5.25)' color='rgb( 86, 180, 233)'/>
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+	<use xlink:href='#gpPt2' transform='translate(456.88,325.30) scale(5.25)' color='rgb( 86, 180, 233)'/>
+	<use xlink:href='#gpPt2' transform='translate(491.74,316.35) scale(5.25)' color='rgb( 86, 180, 233)'/>
+	<use xlink:href='#gpPt2' transform='translate(526.60,307.40) scale(5.25)' color='rgb( 86, 180, 233)'/>
+	<use xlink:href='#gpPt2' transform='translate(561.46,298.45) scale(5.25)' color='rgb( 86, 180, 233)'/>
+	<use xlink:href='#gpPt2' transform='translate(596.32,289.50) scale(5.25)' color='rgb( 86, 180, 233)'/>
+	<use xlink:href='#gpPt2' transform='translate(631.18,280.56) scale(5.25)' color='rgb( 86, 180, 233)'/>
+	<use xlink:href='#gpPt2' transform='translate(666.04,271.61) scale(5.25)' color='rgb( 86, 180, 233)'/>
+	<use xlink:href='#gpPt2' transform='translate(700.90,262.66) scale(5.25)' color='rgb( 86, 180, 233)'/>
+	<use xlink:href='#gpPt2' transform='translate(735.76,253.71) scale(5.25)' color='rgb( 86, 180, 233)'/>
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+	</g>
+	<g id="gnuplot_plot_4" ><title>gnuplot_plot_4</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='rgb(230, 159,   0)'  d='M108.28,101.56 L143.14,186.58 L178.00,262.66 L212.86,329.78 L247.72,387.95 L282.58,437.18 L317.44,477.45 L352.30,508.78
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+		<polygon fill = 'white' points = '270.62,94.51 760.83,94.51 760.83,31.51 270.62,31.51 '/>
+	</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M270.62,94.51 L270.62,31.51 L760.83,31.51 L760.83,94.51 L270.62,94.51 Z  '/></g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(691.59,46.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>using the 'x y xdelta ydelta' style</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='rgb(148,   0, 211)'  d='M701.38,42.01 L751.04,42.01 M701.38,36.76 L701.38,47.26 M751.04,36.76 L751.04,47.26  '/>	<use xlink:href='#gpPt0' transform='translate(726.21,42.01) scale(5.25)' color='rgb(148,   0, 211)'/>
+</g>
+	</g>
+	<g id="gnuplot_plot_2" ><title>gnuplot_plot_2</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(691.59,67.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>using the 'x y xlow xhigh ylow yhigh' style</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='rgb(  0, 158, 115)'  d='M701.38,63.01 L751.04,63.01 M701.38,57.76 L701.38,68.26 M751.04,57.76 L751.04,68.26  '/>	<use xlink:href='#gpPt1' transform='translate(726.21,63.01) scale(5.25)' color='rgb(  0, 158, 115)'/>
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+	</g>
+	<g id="gnuplot_plot_3" ><title>gnuplot_plot_3</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(691.59,88.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>using the 'x y ydelta' style</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='rgb( 86, 180, 233)'  d='M701.38,84.01 L751.04,84.01 M701.38,78.76 L701.38,89.26 M751.04,78.76 L751.04,89.26  '/>	<use xlink:href='#gpPt2' transform='translate(726.21,84.01) scale(5.25)' color='rgb( 86, 180, 233)'/>
+</g>
+	</g>
+	<g id="gnuplot_plot_4" ><title>gnuplot_plot_4</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	</g>
+<g fill="none" color="white" stroke="rgb(230, 159,   0)" stroke-width="2.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="2.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M73.42,21.01 L73.42,558.00 L770.62,558.00 L770.62,21.01 L73.42,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+
diff --git a/guide/guide-13.svg b/guide/guide-13.svg
new file mode 100644
index 0000000..b8193d7
--- /dev/null
+++ b/guide/guide-13.svg
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+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
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+<title>Gnuplot</title>
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+		<text>-6</text>
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+		<text>-4</text>
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+		<text>-2</text>
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+	<path stroke='black'  d='M143.73,289.50 L154.23,289.50 M680.73,289.50 L670.23,289.50  '/>	<g transform="translate(133.94,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
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+	<path stroke='black'  d='M143.73,235.81 L154.23,235.81 M680.73,235.81 L670.23,235.81  '/>	<g transform="translate(133.94,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2</text>
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M143.73,182.11 L154.23,182.11 M680.73,182.11 L670.23,182.11  '/>	<g transform="translate(133.94,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4</text>
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+	<path stroke='black'  d='M143.73,128.41 L154.23,128.41 M680.73,128.41 L670.23,128.41  '/>	<g transform="translate(133.94,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 6</text>
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M143.73,74.71 L680.73,74.71  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M143.73,74.71 L154.23,74.71 M680.73,74.71 L670.23,74.71  '/>	<g transform="translate(133.94,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 8</text>
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+		<text> 10</text>
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+		<text>-10</text>
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+		<text>-8</text>
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+		<text>-6</text>
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+		<text>-4</text>
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+		<text>-2</text>
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+		<text> 2</text>
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+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M519.63,558.00 L519.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M519.63,558.00 L519.63,547.50 M519.63,21.01 L519.63,31.51  '/>	<g transform="translate(519.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M573.33,558.00 L573.33,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M573.33,558.00 L573.33,547.50 M573.33,21.01 L573.33,31.51  '/>	<g transform="translate(573.33,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M627.03,558.00 L627.03,31.51 L627.03,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M627.03,558.00 L627.03,547.50 M627.03,21.01 L627.03,31.51  '/>	<g transform="translate(627.03,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M680.73,558.00 L680.73,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M680.73,558.00 L680.73,547.50 M680.73,21.01 L680.73,31.51  '/>	<g transform="translate(680.73,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M412.23,289.50 L412.23,279.00 M412.23,289.50 L412.23,300.00  '/>	<g transform="translate(412.23,315.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M546.48,289.50 L546.48,279.00 M546.48,289.50 L546.48,300.00  '/>	<g transform="translate(546.48,315.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M680.73,289.50 L680.73,279.00 M680.73,289.50 L680.73,300.00  '/>	<g transform="translate(680.73,315.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M143.73,21.01 L143.73,558.00 L680.73,558.00 L680.73,21.01 L143.73,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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diff --git a/guide/guide-14.svg b/guide/guide-14.svg
new file mode 100644
index 0000000..5fd68a8
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+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
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+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
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+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
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+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
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+	<filter id='greybox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
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+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
+	</filter>
+</defs>
+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L770.62,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L74.13,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(53.84,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,490.88 L770.62,490.88  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,490.88 L74.13,490.88 M770.62,490.88 L760.12,490.88  '/>	<g transform="translate(53.84,495.43)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,423.75 L770.62,423.75  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,423.75 L74.13,423.75 M770.62,423.75 L760.12,423.75  '/>	<g transform="translate(53.84,428.30)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,356.63 L770.62,356.63  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,356.63 L74.13,356.63 M770.62,356.63 L760.12,356.63  '/>	<g transform="translate(53.84,361.18)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2.5</text>
+	</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,289.50 L770.62,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,289.50 L74.13,289.50 M770.62,289.50 L760.12,289.50  '/>	<g transform="translate(53.84,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3</text>
+	</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,222.38 L770.62,222.38  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,222.38 L74.13,222.38 M770.62,222.38 L760.12,222.38  '/>	<g transform="translate(53.84,226.93)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,155.26 L770.62,155.26  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,155.26 L74.13,155.26 M770.62,155.26 L760.12,155.26  '/>	<g transform="translate(53.84,159.81)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4</text>
+	</g>
+</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,88.13 L770.62,88.13  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,88.13 L74.13,88.13 M770.62,88.13 L760.12,88.13  '/>	<g transform="translate(53.84,92.68)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4.5</text>
+	</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,21.01 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L74.13,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(53.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L63.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L63.63,547.50 M63.63,21.01 L63.63,31.51  '/>	<g transform="translate(63.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>05:00</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.98,558.00 L98.98,552.75 M98.98,21.01 L98.98,26.26 M134.33,558.00 L134.33,552.75 M134.33,21.01 L134.33,26.26
+		M169.68,558.00 L169.68,552.75 M169.68,21.01 L169.68,26.26 M205.03,558.00 L205.03,552.75 M205.03,21.01 L205.03,26.26
+		 '/></g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M240.38,558.00 L240.38,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M240.38,558.00 L240.38,547.50 M240.38,21.01 L240.38,31.51  '/>	<g transform="translate(240.38,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>05:05</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M275.73,558.00 L275.73,552.75 M275.73,21.01 L275.73,26.26 M311.08,558.00 L311.08,552.75 M311.08,21.01 L311.08,26.26
+		M346.43,558.00 L346.43,552.75 M346.43,21.01 L346.43,26.26 M381.78,558.00 L381.78,552.75 M381.78,21.01 L381.78,26.26
+		 '/></g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M417.13,558.00 L417.13,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M417.13,558.00 L417.13,547.50 M417.13,21.01 L417.13,31.51  '/>	<g transform="translate(417.13,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>05:10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M452.47,558.00 L452.47,552.75 M452.47,21.01 L452.47,26.26 M487.82,558.00 L487.82,552.75 M487.82,21.01 L487.82,26.26
+		M523.17,558.00 L523.17,552.75 M523.17,21.01 L523.17,26.26 M558.52,558.00 L558.52,552.75 M558.52,21.01 L558.52,26.26
+		 '/></g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M593.87,558.00 L593.87,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M593.87,558.00 L593.87,547.50 M593.87,21.01 L593.87,31.51  '/>	<g transform="translate(593.87,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>05:15</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M629.22,558.00 L629.22,552.75 M629.22,21.01 L629.22,26.26 M664.57,558.00 L664.57,552.75 M664.57,21.01 L664.57,26.26
+		M699.92,558.00 L699.92,552.75 M699.92,21.01 L699.92,26.26 M735.27,558.00 L735.27,552.75 M735.27,21.01 L735.27,26.26
+		 '/></g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M770.62,558.00 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M770.62,558.00 L770.62,547.50 M770.62,21.01 L770.62,31.51  '/>	<g transform="translate(770.62,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>05:20</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L770.62,558.00 L770.62,21.01 L63.63,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='rgb(148,   0, 211)'  d='M346.43,558.00 L381.78,423.75 L417.13,289.50 L452.47,155.26 L487.82,21.01  '/>	<use xlink:href='#gpPt0' transform='translate(346.43,558.00) scale(5.25)' color='rgb(148,   0, 211)'/>
+	<use xlink:href='#gpPt0' transform='translate(381.78,423.75) scale(5.25)' color='rgb(148,   0, 211)'/>
+	<use xlink:href='#gpPt0' transform='translate(417.13,289.50) scale(5.25)' color='rgb(148,   0, 211)'/>
+	<use xlink:href='#gpPt0' transform='translate(452.47,155.26) scale(5.25)' color='rgb(148,   0, 211)'/>
+	<use xlink:href='#gpPt0' transform='translate(487.82,21.01) scale(5.25)' color='rgb(148,   0, 211)'/>
+</g>
+	</g>
+<g fill="none" color="white" stroke="rgb(148,   0, 211)" stroke-width="2.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="2.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L770.62,558.00 L770.62,21.01 L63.63,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+</g>
+</svg>
+
diff --git a/guide/guide-15.svg b/guide/guide-15.svg
new file mode 100644
index 0000000..237302e
--- /dev/null
+++ b/guide/guide-15.svg
@@ -0,0 +1,261 @@
+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
+
+<rect x="0" y="0" width="800" height="600" fill="none"/>
+<defs>
+
+	<circle id='gpDot' r='0.5' stroke-width='0.5' stroke='currentColor'/>
+	<path id='gpPt0' stroke-width='0.190' stroke='currentColor' d='M-1,0 h2 M0,-1 v2'/>
+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
+	<path id='gpPt2' stroke-width='0.190' stroke='currentColor' d='M-1,0 L1,0 M0,-1 L0,1 M-1,-1 L1,1 M-1,1 L1,-1'/>
+	<rect id='gpPt3' stroke-width='0.190' stroke='currentColor' x='-1' y='-1' width='2' height='2'/>
+	<rect id='gpPt4' stroke-width='0.190' stroke='currentColor' fill='currentColor' x='-1' y='-1' width='2' height='2'/>
+	<circle id='gpPt5' stroke-width='0.190' stroke='currentColor' cx='0' cy='0' r='1'/>
+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
+	<use xlink:href='#gpPt9' id='gpPt10' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt3' id='gpPt11' stroke='currentColor' transform='rotate(45)'/>
+	<use xlink:href='#gpPt11' id='gpPt12' fill='currentColor' stroke='none'/>
+	<path id='gpPt13' stroke-width='0.190' stroke='currentColor' d='M0,1.330 L1.265,0.411 L0.782,-1.067 L-0.782,-1.076 L-1.265,0.411 z'/>
+	<use xlink:href='#gpPt13' id='gpPt14' fill='currentColor' stroke='none'/>
+	<filter id='textbox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
+	</filter>
+	<filter id='greybox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='lightgrey' flood-opacity='1' result='grey'/>
+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
+	</filter>
+</defs>
+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L770.62,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L74.13,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(53.84,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,490.88 L770.62,490.88  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,490.88 L74.13,490.88 M770.62,490.88 L760.12,490.88  '/>	<g transform="translate(53.84,495.43)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,423.75 L770.62,423.75  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,423.75 L74.13,423.75 M770.62,423.75 L760.12,423.75  '/>	<g transform="translate(53.84,428.30)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,356.63 L770.62,356.63  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,356.63 L74.13,356.63 M770.62,356.63 L760.12,356.63  '/>	<g transform="translate(53.84,361.18)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,289.50 L770.62,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,289.50 L74.13,289.50 M770.62,289.50 L760.12,289.50  '/>	<g transform="translate(53.84,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,222.38 L770.62,222.38  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,222.38 L74.13,222.38 M770.62,222.38 L760.12,222.38  '/>	<g transform="translate(53.84,226.93)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,155.26 L770.62,155.26  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,155.26 L74.13,155.26 M770.62,155.26 L760.12,155.26  '/>	<g transform="translate(53.84,159.81)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,88.13 L770.62,88.13  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,88.13 L74.13,88.13 M770.62,88.13 L760.12,88.13  '/>	<g transform="translate(53.84,92.68)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,21.01 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L74.13,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(53.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L63.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L63.63,547.50 M63.63,21.01 L63.63,31.51  '/>	<g transform="translate(63.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>06:05:00</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.98,558.00 L98.98,552.75 M98.98,21.01 L98.98,26.26 M134.33,558.00 L134.33,552.75 M134.33,21.01 L134.33,26.26
+		M169.68,558.00 L169.68,552.75 M169.68,21.01 L169.68,26.26 M205.03,558.00 L205.03,552.75 M205.03,21.01 L205.03,26.26
+		 '/></g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M240.38,558.00 L240.38,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M240.38,558.00 L240.38,547.50 M240.38,21.01 L240.38,31.51  '/>	<g transform="translate(240.38,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>06:05:05</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M275.73,558.00 L275.73,552.75 M275.73,21.01 L275.73,26.26 M311.08,558.00 L311.08,552.75 M311.08,21.01 L311.08,26.26
+		M346.43,558.00 L346.43,552.75 M346.43,21.01 L346.43,26.26 M381.78,558.00 L381.78,552.75 M381.78,21.01 L381.78,26.26
+		 '/></g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M417.13,558.00 L417.13,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M417.13,558.00 L417.13,547.50 M417.13,21.01 L417.13,31.51  '/>	<g transform="translate(417.13,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>06:05:10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M452.47,558.00 L452.47,552.75 M452.47,21.01 L452.47,26.26 M487.82,558.00 L487.82,552.75 M487.82,21.01 L487.82,26.26
+		M523.17,558.00 L523.17,552.75 M523.17,21.01 L523.17,26.26 M558.52,558.00 L558.52,552.75 M558.52,21.01 L558.52,26.26
+		 '/></g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M593.87,558.00 L593.87,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M593.87,558.00 L593.87,547.50 M593.87,21.01 L593.87,31.51  '/>	<g transform="translate(593.87,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>06:05:15</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M629.22,558.00 L629.22,552.75 M629.22,21.01 L629.22,26.26 M664.57,558.00 L664.57,552.75 M664.57,21.01 L664.57,26.26
+		M699.92,558.00 L699.92,552.75 M699.92,21.01 L699.92,26.26 M735.27,558.00 L735.27,552.75 M735.27,21.01 L735.27,26.26
+		 '/></g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M770.62,558.00 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M770.62,558.00 L770.62,547.50 M770.62,21.01 L770.62,31.51  '/>	<g transform="translate(770.62,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>06:05:20</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L770.62,558.00 L770.62,21.01 L63.63,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='rgb(148,   0, 211)'  d='M346.43,558.00 L381.78,423.75 L417.13,289.50 L452.47,155.26 L487.82,21.01  '/>	<use xlink:href='#gpPt0' transform='translate(346.43,558.00) scale(5.25)' color='rgb(148,   0, 211)'/>
+	<use xlink:href='#gpPt0' transform='translate(381.78,423.75) scale(5.25)' color='rgb(148,   0, 211)'/>
+	<use xlink:href='#gpPt0' transform='translate(417.13,289.50) scale(5.25)' color='rgb(148,   0, 211)'/>
+	<use xlink:href='#gpPt0' transform='translate(452.47,155.26) scale(5.25)' color='rgb(148,   0, 211)'/>
+	<use xlink:href='#gpPt0' transform='translate(487.82,21.01) scale(5.25)' color='rgb(148,   0, 211)'/>
+</g>
+	</g>
+<g fill="none" color="white" stroke="rgb(148,   0, 211)" stroke-width="2.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="2.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L770.62,558.00 L770.62,21.01 L63.63,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+</g>
+</svg>
+
diff --git a/guide/guide-16.svg b/guide/guide-16.svg
new file mode 100644
index 0000000..89a0947
--- /dev/null
+++ b/guide/guide-16.svg
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+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
+
+<rect x="0" y="0" width="800" height="600" fill="none"/>
+<defs>
+
+	<circle id='gpDot' r='0.5' stroke-width='0.5' stroke='currentColor'/>
+	<path id='gpPt0' stroke-width='0.190' stroke='currentColor' d='M-1,0 h2 M0,-1 v2'/>
+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
+	<path id='gpPt2' stroke-width='0.190' stroke='currentColor' d='M-1,0 L1,0 M0,-1 L0,1 M-1,-1 L1,1 M-1,1 L1,-1'/>
+	<rect id='gpPt3' stroke-width='0.190' stroke='currentColor' x='-1' y='-1' width='2' height='2'/>
+	<rect id='gpPt4' stroke-width='0.190' stroke='currentColor' fill='currentColor' x='-1' y='-1' width='2' height='2'/>
+	<circle id='gpPt5' stroke-width='0.190' stroke='currentColor' cx='0' cy='0' r='1'/>
+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
+	<use xlink:href='#gpPt9' id='gpPt10' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt3' id='gpPt11' stroke='currentColor' transform='rotate(45)'/>
+	<use xlink:href='#gpPt11' id='gpPt12' fill='currentColor' stroke='none'/>
+	<path id='gpPt13' stroke-width='0.190' stroke='currentColor' d='M0,1.330 L1.265,0.411 L0.782,-1.067 L-0.782,-1.076 L-1.265,0.411 z'/>
+	<use xlink:href='#gpPt13' id='gpPt14' fill='currentColor' stroke='none'/>
+	<filter id='textbox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
+	</filter>
+	<filter id='greybox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='lightgrey' flood-opacity='1' result='grey'/>
+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
+	</filter>
+</defs>
+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,558.00 L54.55,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(34.26,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,468.50 L54.55,468.50 M770.62,468.50 L760.12,468.50  '/>	<g transform="translate(34.26,473.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,379.00 L54.55,379.00 M770.62,379.00 L760.12,379.00  '/>	<g transform="translate(34.26,383.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,289.50 L54.55,289.50 M770.62,289.50 L760.12,289.50  '/>	<g transform="translate(34.26,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,200.01 L54.55,200.01 M770.62,200.01 L760.12,200.01  '/>	<g transform="translate(34.26,204.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,110.51 L54.55,110.51 M770.62,110.51 L760.12,110.51  '/>	<g transform="translate(34.26,115.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,21.01 L54.55,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(34.26,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,558.00 L44.05,547.50 M44.05,21.01 L44.05,31.51  '/>	<g transform="translate(44.05,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M189.36,558.00 L189.36,547.50 M189.36,21.01 L189.36,31.51  '/>	<g transform="translate(189.36,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M334.68,558.00 L334.68,547.50 M334.68,21.01 L334.68,31.51  '/>	<g transform="translate(334.68,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M479.99,558.00 L479.99,547.50 M479.99,21.01 L479.99,31.51  '/>	<g transform="translate(479.99,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 3</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M625.31,558.00 L625.31,547.50 M625.31,21.01 L625.31,31.51  '/>	<g transform="translate(625.31,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M770.62,558.00 L770.62,547.50 M770.62,21.01 L770.62,31.51  '/>	<g transform="translate(770.62,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,21.01 L44.05,558.00 L770.62,558.00 L770.62,21.01 L44.05,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(189.36,473.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>aaa</text>
+	</g>
+	<g transform="translate(334.68,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>bbb</text>
+	</g>
+	<g transform="translate(625.31,115.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>ccc</text>
+	</g>
+</g>
+	</g>
+<g fill="none" color="white" stroke="black" stroke-width="2.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="2.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,21.01 L44.05,558.00 L770.62,558.00 L770.62,21.01 L44.05,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+</g>
+</svg>
+
diff --git a/guide/guide-17.svg b/guide/guide-17.svg
new file mode 100644
index 0000000..11a71d1
--- /dev/null
+++ b/guide/guide-17.svg
@@ -0,0 +1,306 @@
+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
+
+<rect x="0" y="0" width="800" height="600" fill="none"/>
+<defs>
+
+	<circle id='gpDot' r='0.5' stroke-width='0.5' stroke='currentColor'/>
+	<path id='gpPt0' stroke-width='0.190' stroke='currentColor' d='M-1,0 h2 M0,-1 v2'/>
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+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,558.00 L714.37,558.00 L714.37,21.01 L683.20,21.01 L683.20,558.00 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M714.37,558.00 L703.87,558.00  '/>	<g transform="translate(724.16,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,558.00 L693.70,558.00 M714.37,450.61 L703.87,450.61  '/>	<g transform="translate(724.16,455.16)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 12</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,450.61 L693.70,450.61 M714.37,343.21 L703.87,343.21  '/>	<g transform="translate(724.16,347.76)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 14</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,343.21 L693.70,343.21 M714.37,235.81 L703.87,235.81  '/>	<g transform="translate(724.16,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 16</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,235.81 L693.70,235.81 M714.37,128.41 L703.87,128.41  '/>	<g transform="translate(724.16,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 18</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,128.41 L693.70,128.41 M714.37,21.01 L703.87,21.01  '/>	<g transform="translate(724.16,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 20</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,21.01 L693.70,21.01  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+</g>
+</svg>
+
diff --git a/guide/guide-18.svg b/guide/guide-18.svg
new file mode 100644
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+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,448.36 L212.06,443.81  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M348.23,325.89 L342.98,330.43  '/>	<g transform="translate(201.93,461.99)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text>-0.8</text>
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+		<text>-0.6</text>
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+		<text>-0.4</text>
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+		<text>-0.2</text>
+	</g>
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+		<text> 0</text>
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+		<text> 0.2</text>
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+</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text> 0.4</text>
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+</g>
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+</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M427.26,512.00 L432.51,507.45  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M568.68,389.53 L563.43,394.07  '/>	<g transform="translate(422.37,525.63)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M451.76,519.07 L457.01,514.52  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M593.18,396.60 L587.93,401.14  '/>	<g transform="translate(446.86,532.70)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 1</text>
+	</g>
+</g>
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+</g>
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M451.76,519.07 L442.67,516.44  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,448.36 L215.90,450.98  '/>	<g transform="translate(460.24,528.86)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
+	</g>
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+</g>
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+	<path stroke='black'  d='M465.90,506.82 L456.81,504.20  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text>-0.8</text>
+	</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+	<path stroke='black'  d='M480.04,494.58 L470.95,491.95  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text>-0.6</text>
+	</g>
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+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M494.18,482.33 L485.09,479.70  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text>-0.4</text>
+	</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M508.33,470.08 L499.23,467.46  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M263.38,399.37 L272.47,402.00  '/>	<g transform="translate(516.80,479.87)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.2</text>
+	</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+</g>
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+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M522.47,457.83 L513.38,455.21  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M277.52,387.12 L286.61,389.75  '/>	<g transform="translate(530.95,467.62)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M536.61,445.59 L527.52,442.96  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M291.66,374.88 L300.76,377.50  '/>	<g transform="translate(545.09,455.38)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M550.75,433.34 L541.66,430.71  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M564.89,421.09 L555.80,418.47  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M579.04,408.84 L569.94,406.22  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M334.09,338.13 L343.18,340.76  '/>	<g transform="translate(587.51,418.63)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M593.18,396.60 L584.09,393.97  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M348.23,325.89 L357.32,328.51  '/>	<g transform="translate(601.66,406.39)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 1</text>
+	</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,366.71 L217.31,366.71  '/>	<g transform="translate(185.82,371.25)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,350.38 L217.31,350.38  '/>	<g transform="translate(185.82,354.92)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,334.05 L217.31,334.05  '/>	<g transform="translate(185.82,338.59)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,317.72 L217.31,317.72  '/>	<g transform="translate(185.82,322.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,301.39 L217.31,301.39  '/>	<g transform="translate(185.82,305.93)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,285.06 L217.31,285.06  '/>	<g transform="translate(185.82,289.61)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,268.73 L217.31,268.73  '/>	<g transform="translate(185.82,273.28)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,252.40 L217.31,252.40  '/>	<g transform="translate(185.82,256.95)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,236.07 L217.31,236.07  '/>	<g transform="translate(185.82,240.62)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,219.74 L217.31,219.74  '/>	<g transform="translate(185.82,224.29)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M206.81,203.41 L217.31,203.41  '/>	<g transform="translate(185.82,207.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+		<polygon fill = 'rgb(254, 249,   0)' points = '600.53,160.86 620.04,160.86 620.04,159.43 600.53,159.43 '/>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,341.58 L620.04,341.58 L620.04,159.43 L600.53,159.43 L600.53,341.58 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M620.04,341.58 L609.54,341.58  '/>	<g transform="translate(629.83,346.13)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,341.58 L611.03,341.58 M620.04,323.37 L609.54,323.37  '/>	<g transform="translate(629.83,327.92)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 0.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,323.37 L611.03,323.37 M620.04,305.15 L609.54,305.15  '/>	<g transform="translate(629.83,309.70)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,305.15 L611.03,305.15 M620.04,286.94 L609.54,286.94  '/>	<g transform="translate(629.83,291.49)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 1.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,286.94 L611.03,286.94 M620.04,268.72 L609.54,268.72  '/>	<g transform="translate(629.83,273.27)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,268.72 L611.03,268.72 M620.04,250.51 L609.54,250.51  '/>	<g transform="translate(629.83,255.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 2.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,250.51 L611.03,250.51 M620.04,232.29 L609.54,232.29  '/>	<g transform="translate(629.83,236.84)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 3</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,232.29 L611.03,232.29 M620.04,214.08 L609.54,214.08  '/>	<g transform="translate(629.83,218.63)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 3.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,214.08 L611.03,214.08 M620.04,195.86 L609.54,195.86  '/>	<g transform="translate(629.83,200.41)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,195.86 L611.03,195.86 M620.04,177.65 L609.54,177.65  '/>	<g transform="translate(629.83,182.20)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 4.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,177.65 L611.03,177.65 M620.04,159.43 L609.54,159.43  '/>	<g transform="translate(629.83,163.98)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M600.53,159.43 L611.03,159.43  '/>	<g transform="translate(400.00,47.27)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>Double helix</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+</g>
+</svg>
+
diff --git a/guide/guide-19.svg b/guide/guide-19.svg
new file mode 100644
index 0000000..deab593
--- /dev/null
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+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
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+<g id="gnuplot_canvas">
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+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
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+	<circle id='gpPt5' stroke-width='0.190' stroke='currentColor' cx='0' cy='0' r='1'/>
+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
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+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
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+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L770.62,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L74.13,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(53.84,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,498.33 L770.62,498.33  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,498.33 L74.13,498.33 M770.62,498.33 L760.12,498.33  '/>	<g transform="translate(53.84,502.88)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 100</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,438.67 L770.62,438.67  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,438.67 L74.13,438.67 M770.62,438.67 L760.12,438.67  '/>	<g transform="translate(53.84,443.22)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 200</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,379.00 L770.62,379.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,379.00 L74.13,379.00 M770.62,379.00 L760.12,379.00  '/>	<g transform="translate(53.84,383.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 300</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,319.34 L770.62,319.34  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,319.34 L74.13,319.34 M770.62,319.34 L760.12,319.34  '/>	<g transform="translate(53.84,323.89)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 400</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,259.67 L770.62,259.67  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,259.67 L74.13,259.67 M770.62,259.67 L760.12,259.67  '/>	<g transform="translate(53.84,264.22)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 500</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,200.01 L770.62,200.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,200.01 L74.13,200.01 M770.62,200.01 L760.12,200.01  '/>	<g transform="translate(53.84,204.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 600</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,140.34 L770.62,140.34  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,140.34 L74.13,140.34 M770.62,140.34 L760.12,140.34  '/>	<g transform="translate(53.84,144.89)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 700</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,80.68 L74.13,80.68 M770.62,80.68 L760.12,80.68  '/>	<g transform="translate(53.84,85.23)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 800</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L74.13,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(53.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 900</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L63.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L63.63,547.50 M63.63,21.01 L63.63,31.51  '/>	<g transform="translate(63.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-4</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M152.00,558.00 L152.00,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M152.00,558.00 L152.00,547.50 M152.00,21.01 L152.00,31.51  '/>	<g transform="translate(152.00,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-3</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M240.38,558.00 L240.38,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M240.38,558.00 L240.38,547.50 M240.38,21.01 L240.38,31.51  '/>	<g transform="translate(240.38,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-2</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M328.75,558.00 L328.75,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M328.75,558.00 L328.75,547.50 M328.75,21.01 L328.75,31.51  '/>	<g transform="translate(328.75,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M417.13,558.00 L417.13,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M417.13,558.00 L417.13,547.50 M417.13,21.01 L417.13,31.51  '/>	<g transform="translate(417.13,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M505.50,558.00 L505.50,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M505.50,558.00 L505.50,547.50 M505.50,21.01 L505.50,31.51  '/>	<g transform="translate(505.50,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M593.87,558.00 L593.87,52.51 M593.87,31.51 L593.87,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M593.87,558.00 L593.87,547.50 M593.87,21.01 L593.87,31.51  '/>	<g transform="translate(593.87,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M682.25,558.00 L682.25,52.51 M682.25,31.51 L682.25,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M682.25,558.00 L682.25,547.50 M682.25,21.01 L682.25,31.51  '/>	<g transform="translate(682.25,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 3</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M770.62,558.00 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M770.62,558.00 L770.62,547.50 M770.62,21.01 L770.62,31.51  '/>	<g transform="translate(770.62,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 4</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L770.62,558.00 L770.62,21.01 L63.63,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+		<text>Limit gaussian</text>
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+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
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+<title>Gnuplot</title>
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+	<path stroke='black'  d='M63.63,289.50 L74.13,289.50 M770.62,289.50 L760.12,289.50  '/>	<g transform="translate(53.84,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,235.81 L770.62,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,235.81 L74.13,235.81 M770.62,235.81 L760.12,235.81  '/>	<g transform="translate(53.84,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,182.11 L770.62,182.11  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,182.11 L74.13,182.11 M770.62,182.11 L760.12,182.11  '/>	<g transform="translate(53.84,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,128.41 L770.62,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,128.41 L74.13,128.41 M770.62,128.41 L760.12,128.41  '/>	<g transform="translate(53.84,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,74.71 L770.62,74.71  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,74.71 L74.13,74.71 M770.62,74.71 L760.12,74.71  '/>	<g transform="translate(53.84,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,21.01 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L74.13,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(53.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L63.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L63.63,547.50 M63.63,21.01 L63.63,31.51  '/>	<g transform="translate(63.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M134.33,558.00 L134.33,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M134.33,558.00 L134.33,547.50 M134.33,21.01 L134.33,31.51  '/>	<g transform="translate(134.33,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M205.03,558.00 L205.03,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M205.03,558.00 L205.03,547.50 M205.03,21.01 L205.03,31.51  '/>	<g transform="translate(205.03,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 20</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M275.73,558.00 L275.73,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M275.73,558.00 L275.73,547.50 M275.73,21.01 L275.73,31.51  '/>	<g transform="translate(275.73,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 30</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M346.43,558.00 L346.43,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M346.43,558.00 L346.43,547.50 M346.43,21.01 L346.43,31.51  '/>	<g transform="translate(346.43,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 40</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M417.13,558.00 L417.13,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M417.13,558.00 L417.13,547.50 M417.13,21.01 L417.13,31.51  '/>	<g transform="translate(417.13,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 50</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M487.82,558.00 L487.82,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M487.82,558.00 L487.82,547.50 M487.82,21.01 L487.82,31.51  '/>	<g transform="translate(487.82,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 60</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M558.52,558.00 L558.52,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M558.52,558.00 L558.52,547.50 M558.52,21.01 L558.52,31.51  '/>	<g transform="translate(558.52,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 70</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M629.22,558.00 L629.22,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M629.22,558.00 L629.22,547.50 M629.22,21.01 L629.22,31.51  '/>	<g transform="translate(629.22,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 80</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M699.92,558.00 L699.92,31.51 L699.92,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M699.92,558.00 L699.92,547.50 M699.92,21.01 L699.92,31.51  '/>	<g transform="translate(699.92,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 90</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M770.62,558.00 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M770.62,558.00 L770.62,547.50 M770.62,21.01 L770.62,31.51  '/>	<g transform="translate(770.62,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 100</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L770.62,558.00 L770.62,21.01 L63.63,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+</g>
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diff --git a/guide/guide-20.svg b/guide/guide-20.svg
new file mode 100644
index 0000000..aa17142
--- /dev/null
+++ b/guide/guide-20.svg
@@ -0,0 +1,1611 @@
+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
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+<rect x="0" y="0" width="800" height="600" fill="none"/>
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+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
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+	<circle id='gpPt5' stroke-width='0.190' stroke='currentColor' cx='0' cy='0' r='1'/>
+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
+	<use xlink:href='#gpPt9' id='gpPt10' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt3' id='gpPt11' stroke='currentColor' transform='rotate(45)'/>
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+	<use xlink:href='#gpPt13' id='gpPt14' fill='currentColor' stroke='none'/>
+	<filter id='textbox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
+	</filter>
+	<filter id='greybox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='lightgrey' flood-opacity='1' result='grey'/>
+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
+	</filter>
+</defs>
+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L770.62,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L74.13,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(53.84,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,498.33 L770.62,498.33  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,498.33 L74.13,498.33 M770.62,498.33 L760.12,498.33  '/>	<g transform="translate(53.84,502.88)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 100</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,438.67 L770.62,438.67  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,438.67 L74.13,438.67 M770.62,438.67 L760.12,438.67  '/>	<g transform="translate(53.84,443.22)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 200</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,379.00 L770.62,379.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,379.00 L74.13,379.00 M770.62,379.00 L760.12,379.00  '/>	<g transform="translate(53.84,383.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 300</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,319.34 L770.62,319.34  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,319.34 L74.13,319.34 M770.62,319.34 L760.12,319.34  '/>	<g transform="translate(53.84,323.89)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 400</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,259.67 L770.62,259.67  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,259.67 L74.13,259.67 M770.62,259.67 L760.12,259.67  '/>	<g transform="translate(53.84,264.22)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 500</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,200.01 L770.62,200.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,200.01 L74.13,200.01 M770.62,200.01 L760.12,200.01  '/>	<g transform="translate(53.84,204.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 600</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,140.34 L770.62,140.34  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,140.34 L74.13,140.34 M770.62,140.34 L760.12,140.34  '/>	<g transform="translate(53.84,144.89)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 700</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,80.68 L554.53,80.68 M760.83,80.68 L770.62,80.68  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,80.68 L74.13,80.68 M770.62,80.68 L760.12,80.68  '/>	<g transform="translate(53.84,85.23)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 800</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,21.01 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L74.13,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(53.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 900</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L63.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L63.63,547.50 M63.63,21.01 L63.63,31.51  '/>	<g transform="translate(63.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-3</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M181.46,558.00 L181.46,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M181.46,558.00 L181.46,547.50 M181.46,21.01 L181.46,31.51  '/>	<g transform="translate(181.46,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+		<text> 1</text>
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+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,558.00 L54.55,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(34.26,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,450.60 L54.55,450.60 M770.62,450.60 L760.12,450.60  '/>	<g transform="translate(34.26,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,343.20 L54.55,343.20 M770.62,343.20 L760.12,343.20  '/>	<g transform="translate(34.26,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,235.81 L54.55,235.81 M770.62,235.81 L760.12,235.81  '/>	<g transform="translate(34.26,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,128.41 L54.55,128.41 M770.62,128.41 L760.12,128.41  '/>	<g transform="translate(34.26,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,21.01 L54.55,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(34.26,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M134.87,558.00 L134.87,547.50 M134.87,21.01 L134.87,31.51  '/>	<g transform="translate(134.87,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>aaa</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M225.69,558.00 L225.69,547.50 M225.69,21.01 L225.69,31.51  '/>	<g transform="translate(225.69,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>bbb</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M588.98,558.00 L588.98,547.50 M588.98,21.01 L588.98,31.51  '/>	<g transform="translate(588.98,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>ccc</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M679.80,558.00 L679.80,547.50 M679.80,21.01 L679.80,31.51  '/>	<g transform="translate(679.80,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>ddd</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,21.01 L44.05,558.00 L770.62,558.00 L770.62,21.01 L44.05,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+	<g id="gnuplot_plot_2" ><title>gnuplot_plot_2</title>
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diff --git a/guide/guide-23.svg b/guide/guide-23.svg
new file mode 100644
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+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
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+</defs>
+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,558.00 L54.55,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(34.26,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,450.60 L54.55,450.60 M770.62,450.60 L760.12,450.60  '/>	<g transform="translate(34.26,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,343.20 L54.55,343.20 M770.62,343.20 L760.12,343.20  '/>	<g transform="translate(34.26,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,235.81 L54.55,235.81 M770.62,235.81 L760.12,235.81  '/>	<g transform="translate(34.26,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,128.41 L54.55,128.41 M770.62,128.41 L760.12,128.41  '/>	<g transform="translate(34.26,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,21.01 L54.55,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(34.26,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M189.36,558.00 L189.36,547.50 M189.36,21.01 L189.36,31.51  '/>	<g transform="translate(189.36,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>aaa</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M334.68,558.00 L334.68,547.50 M334.68,21.01 L334.68,31.51  '/>	<g transform="translate(334.68,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>bbb</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M479.99,558.00 L479.99,547.50 M479.99,21.01 L479.99,31.51  '/>	<g transform="translate(479.99,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>ccc</text>
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+	<path stroke='black'  d='M625.31,558.00 L625.31,547.50 M625.31,21.01 L625.31,31.51  '/>	<g transform="translate(625.31,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>ddd</text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+	<g transform="translate(691.59,46.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>a</text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+	<path stroke='black'  d='M588.98,558.00 L588.98,343.20 L625.31,343.20 L625.31,558.00 L588.98,558.00 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	</g>
+	<g id="gnuplot_plot_2" ><title>gnuplot_plot_2</title>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<g transform="translate(691.59,67.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>b</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,558.00 L54.55,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(34.26,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,498.33 L54.55,498.33 M770.62,498.33 L760.12,498.33  '/>	<g transform="translate(34.26,502.88)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,438.67 L54.55,438.67 M770.62,438.67 L760.12,438.67  '/>	<g transform="translate(34.26,443.22)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2</text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,379.00 L54.55,379.00 M770.62,379.00 L760.12,379.00  '/>	<g transform="translate(34.26,383.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 3</text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,319.34 L54.55,319.34 M770.62,319.34 L760.12,319.34  '/>	<g transform="translate(34.26,323.89)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,259.67 L54.55,259.67 M770.62,259.67 L760.12,259.67  '/>	<g transform="translate(34.26,264.22)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 5</text>
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+	<path stroke='black'  d='M44.05,200.01 L54.55,200.01 M770.62,200.01 L760.12,200.01  '/>	<g transform="translate(34.26,204.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 6</text>
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+	<path stroke='black'  d='M44.05,140.34 L54.55,140.34 M770.62,140.34 L760.12,140.34  '/>	<g transform="translate(34.26,144.89)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 7</text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,80.68 L54.55,80.68 M770.62,80.68 L760.12,80.68  '/>	<g transform="translate(34.26,85.23)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 8</text>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M44.05,21.01 L54.55,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(34.26,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 9</text>
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+		<text>bbb</text>
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+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M479.99,558.00 L479.99,547.50 M479.99,21.01 L479.99,31.51  '/>	<g transform="translate(479.99,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>ccc</text>
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+	<path stroke='black'  d='M625.31,558.00 L625.31,547.50 M625.31,21.01 L625.31,31.51  '/>	<g transform="translate(625.31,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>ddd</text>
+	</g>
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+</g>
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+	<path stroke='black'  d='M44.05,21.01 L44.05,558.00 L770.62,558.00 L770.62,21.01 L44.05,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+	<g transform="translate(691.59,46.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>a</text>
+	</g>
+</g>
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+	<g transform="translate(691.59,67.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>b</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,558.00 L714.37,558.00 L714.37,21.01 L683.20,21.01 L683.20,558.00 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M714.37,558.00 L703.87,558.00  '/>	<g transform="translate(724.16,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,558.00 L693.70,558.00 M714.37,468.51 L703.87,468.51  '/>	<g transform="translate(724.16,473.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 1.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,468.51 L693.70,468.51 M714.37,379.01 L703.87,379.01  '/>	<g transform="translate(724.16,383.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,379.01 L693.70,379.01 M714.37,289.51 L703.87,289.51  '/>	<g transform="translate(724.16,294.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 2.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,289.51 L693.70,289.51 M714.37,200.01 L703.87,200.01  '/>	<g transform="translate(724.16,204.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 3</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,200.01 L693.70,200.01 M714.37,110.51 L703.87,110.51  '/>	<g transform="translate(724.16,115.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 3.5</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,110.51 L693.70,110.51 M714.37,21.01 L703.87,21.01  '/>	<g transform="translate(724.16,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M683.20,21.01 L693.70,21.01  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+</g>
+</svg>
+
diff --git a/guide/guide-26.svg b/guide/guide-26.svg
new file mode 100644
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+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
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+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
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+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
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+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
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+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
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+</defs>
+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M138.84,558.00 L675.83,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M138.84,558.00 L149.34,558.00 M675.83,558.00 L665.33,558.00  '/>	<g transform="translate(129.05,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M138.84,468.50 L675.83,468.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M138.84,468.50 L149.34,468.50 M675.83,468.50 L665.33,468.50  '/>	<g transform="translate(129.05,473.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M138.84,379.00 L675.83,379.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M138.84,379.00 L149.34,379.00 M675.83,379.00 L665.33,379.00  '/>	<g transform="translate(129.05,383.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M138.84,289.50 L675.83,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M138.84,289.50 L149.34,289.50 M675.83,289.50 L665.33,289.50  '/>	<g transform="translate(129.05,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M138.84,200.01 L675.83,200.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M138.84,200.01 L149.34,200.01 M675.83,200.01 L665.33,200.01  '/>	<g transform="translate(129.05,204.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 2</text>
+	</g>
+</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M138.84,110.51 L675.83,110.51  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M138.84,110.51 L149.34,110.51 M675.83,110.51 L665.33,110.51  '/>	<g transform="translate(129.05,115.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M138.84,21.01 L675.83,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M138.84,21.01 L149.34,21.01 M675.83,21.01 L665.33,21.01  '/>	<g transform="translate(129.05,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M138.84,558.00 L138.84,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M138.84,558.00 L138.84,547.50 M138.84,21.01 L138.84,31.51  '/>	<g transform="translate(138.84,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-6</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M228.34,558.00 L228.34,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M228.34,558.00 L228.34,547.50 M228.34,21.01 L228.34,31.51  '/>	<g transform="translate(228.34,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-4</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M317.84,558.00 L317.84,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M317.84,558.00 L317.84,547.50 M317.84,21.01 L317.84,31.51  '/>	<g transform="translate(317.84,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M407.34,558.00 L407.34,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M407.34,558.00 L407.34,547.50 M407.34,21.01 L407.34,31.51  '/>	<g transform="translate(407.34,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M496.83,558.00 L496.83,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M496.83,558.00 L496.83,547.50 M496.83,21.01 L496.83,31.51  '/>	<g transform="translate(496.83,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 2</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M586.33,558.00 L586.33,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M586.33,558.00 L586.33,547.50 M586.33,21.01 L586.33,31.51  '/>	<g transform="translate(586.33,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 4</text>
+	</g>
+</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M675.83,558.00 L675.83,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M675.83,558.00 L675.83,547.50 M675.83,21.01 L675.83,31.51  '/>	<g transform="translate(675.83,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 6</text>
+	</g>
+</g>
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+</g>
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+	<path stroke='black'  d='M138.84,21.01 L138.84,558.00 L675.83,558.00 L675.83,21.01 L138.84,21.01 Z  '/></g>
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diff --git a/guide/guide-3.svg b/guide/guide-3.svg
new file mode 100644
index 0000000..42fcdac
--- /dev/null
+++ b/guide/guide-3.svg
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+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
+
+<rect x="0" y="0" width="800" height="600" fill="none"/>
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+	<circle id='gpDot' r='0.5' stroke-width='0.5' stroke='currentColor'/>
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+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
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+	<circle id='gpPt5' stroke-width='0.190' stroke='currentColor' cx='0' cy='0' r='1'/>
+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
+	<use xlink:href='#gpPt9' id='gpPt10' fill='currentColor' stroke='none'/>
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+	<filter id='textbox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
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+	<filter id='greybox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
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+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
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+</defs>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L770.62,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L74.13,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(53.84,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,504.30 L770.62,504.30  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,504.30 L74.13,504.30 M770.62,504.30 L760.12,504.30  '/>	<g transform="translate(53.84,508.85)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,450.60 L770.62,450.60  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,450.60 L74.13,450.60 M770.62,450.60 L760.12,450.60  '/>	<g transform="translate(53.84,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,396.90 L770.62,396.90  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,396.90 L74.13,396.90 M770.62,396.90 L760.12,396.90  '/>	<g transform="translate(53.84,401.45)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,343.20 L770.62,343.20  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,343.20 L74.13,343.20 M770.62,343.20 L760.12,343.20  '/>	<g transform="translate(53.84,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,289.50 L770.62,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,289.50 L74.13,289.50 M770.62,289.50 L760.12,289.50  '/>	<g transform="translate(53.84,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,235.81 L770.62,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,235.81 L74.13,235.81 M770.62,235.81 L760.12,235.81  '/>	<g transform="translate(53.84,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,182.11 L770.62,182.11  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,182.11 L74.13,182.11 M770.62,182.11 L760.12,182.11  '/>	<g transform="translate(53.84,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,128.41 L770.62,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,128.41 L74.13,128.41 M770.62,128.41 L760.12,128.41  '/>	<g transform="translate(53.84,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,74.71 L770.62,74.71  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,74.71 L74.13,74.71 M770.62,74.71 L760.12,74.71  '/>	<g transform="translate(53.84,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,21.01 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L74.13,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(53.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L63.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L63.63,547.50 M63.63,21.01 L63.63,31.51  '/>	<g transform="translate(63.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M134.33,558.00 L134.33,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M134.33,558.00 L134.33,547.50 M134.33,21.01 L134.33,31.51  '/>	<g transform="translate(134.33,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 10</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M205.03,558.00 L205.03,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M205.03,558.00 L205.03,547.50 M205.03,21.01 L205.03,31.51  '/>	<g transform="translate(205.03,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 20</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M275.73,558.00 L275.73,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M275.73,558.00 L275.73,547.50 M275.73,21.01 L275.73,31.51  '/>	<g transform="translate(275.73,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 30</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M346.43,558.00 L346.43,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M346.43,558.00 L346.43,547.50 M346.43,21.01 L346.43,31.51  '/>	<g transform="translate(346.43,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 40</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M417.13,558.00 L417.13,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M417.13,558.00 L417.13,547.50 M417.13,21.01 L417.13,31.51  '/>	<g transform="translate(417.13,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 50</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M487.82,558.00 L487.82,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M487.82,558.00 L487.82,547.50 M487.82,21.01 L487.82,31.51  '/>	<g transform="translate(487.82,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 60</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M558.52,558.00 L558.52,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M558.52,558.00 L558.52,547.50 M558.52,21.01 L558.52,31.51  '/>	<g transform="translate(558.52,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 70</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M629.22,558.00 L629.22,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M629.22,558.00 L629.22,547.50 M629.22,21.01 L629.22,31.51  '/>	<g transform="translate(629.22,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 80</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M699.92,558.00 L699.92,31.51 L699.92,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M699.92,558.00 L699.92,547.50 M699.92,21.01 L699.92,31.51  '/>	<g transform="translate(699.92,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 90</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M770.62,558.00 L770.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M770.62,558.00 L770.62,547.50 M770.62,21.01 L770.62,31.51  '/>	<g transform="translate(770.62,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 100</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L770.62,558.00 L770.62,21.01 L63.63,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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diff --git a/guide/guide-4.svg b/guide/guide-4.svg
new file mode 100644
index 0000000..8df8e96
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+++ b/guide/guide-4.svg
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+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
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+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
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+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,558.00 L770.62,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L74.13,558.00 M770.62,558.00 L760.12,558.00  '/>	<g transform="translate(53.84,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,504.30 L770.62,504.30  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,504.30 L74.13,504.30 M770.62,504.30 L760.12,504.30  '/>	<g transform="translate(53.84,508.85)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,450.60 L74.13,450.60 M770.62,450.60 L760.12,450.60  '/>	<g transform="translate(53.84,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.6</text>
+	</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,396.90 L770.62,396.90  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,396.90 L74.13,396.90 M770.62,396.90 L760.12,396.90  '/>	<g transform="translate(53.84,401.45)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,343.20 L770.62,343.20  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,343.20 L74.13,343.20 M770.62,343.20 L760.12,343.20  '/>	<g transform="translate(53.84,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,289.50 L770.62,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,289.50 L74.13,289.50 M770.62,289.50 L760.12,289.50  '/>	<g transform="translate(53.84,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,235.81 L770.62,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,235.81 L74.13,235.81 M770.62,235.81 L760.12,235.81  '/>	<g transform="translate(53.84,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,182.11 L770.62,182.11  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,182.11 L74.13,182.11 M770.62,182.11 L760.12,182.11  '/>	<g transform="translate(53.84,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M63.63,128.41 L770.62,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,128.41 L74.13,128.41 M770.62,128.41 L760.12,128.41  '/>	<g transform="translate(53.84,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+	<path stroke='black'  d='M63.63,74.71 L74.13,74.71 M770.62,74.71 L760.12,74.71  '/>	<g transform="translate(53.84,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L74.13,21.01 M770.62,21.01 L760.12,21.01  '/>	<g transform="translate(53.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
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+</g>
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,558.00 L63.63,547.50 M63.63,21.01 L63.63,31.51  '/>	<g transform="translate(63.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
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+	<path stroke='black'  d='M134.33,558.00 L134.33,547.50 M134.33,21.01 L134.33,31.51  '/>	<g transform="translate(134.33,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.8</text>
+	</g>
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+</g>
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+		<text>-0.6</text>
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+</g>
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+	<path stroke='black'  d='M275.73,558.00 L275.73,547.50 M275.73,21.01 L275.73,31.51  '/>	<g transform="translate(275.73,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.4</text>
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M346.43,558.00 L346.43,547.50 M346.43,21.01 L346.43,31.51  '/>	<g transform="translate(346.43,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.2</text>
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+	<path stroke='black'  d='M417.13,558.00 L417.13,547.50 M417.13,21.01 L417.13,31.51  '/>	<g transform="translate(417.13,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
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+</g>
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+	<path stroke='black'  d='M487.82,558.00 L487.82,547.50 M487.82,21.01 L487.82,31.51  '/>	<g transform="translate(487.82,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.2</text>
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+</g>
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+	<path stroke='black'  d='M558.52,558.00 L558.52,547.50 M558.52,21.01 L558.52,31.51  '/>	<g transform="translate(558.52,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.4</text>
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+		<text> 0.6</text>
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+		<text> 0.8</text>
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+		<text> 1</text>
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+<g fill="none" color="black" stroke="black" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M63.63,21.01 L63.63,558.00 L770.62,558.00 L770.62,21.01 L63.63,21.01 Z  '/></g>
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diff --git a/guide/guide-5.svg b/guide/guide-5.svg
new file mode 100644
index 0000000..4c64329
--- /dev/null
+++ b/guide/guide-5.svg
@@ -0,0 +1,464 @@
+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
+
+<rect x="0" y="0" width="800" height="600" fill="none"/>
+<defs>
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+	<circle id='gpDot' r='0.5' stroke-width='0.5' stroke='currentColor'/>
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+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
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+	<circle id='gpPt5' stroke-width='0.190' stroke='currentColor' cx='0' cy='0' r='1'/>
+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
+	<use xlink:href='#gpPt9' id='gpPt10' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt3' id='gpPt11' stroke='currentColor' transform='rotate(45)'/>
+	<use xlink:href='#gpPt11' id='gpPt12' fill='currentColor' stroke='none'/>
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+	<filter id='textbox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
+	</filter>
+	<filter id='greybox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='lightgrey' flood-opacity='1' result='grey'/>
+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
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+</defs>
+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,558.00 L685.62,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,558.00 L159.13,558.00 M685.62,558.00 L675.12,558.00  '/>	<g transform="translate(138.84,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,504.30 L685.62,504.30  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,504.30 L159.13,504.30 M685.62,504.30 L675.12,504.30  '/>	<g transform="translate(138.84,508.85)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,450.60 L685.62,450.60  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,450.60 L159.13,450.60 M685.62,450.60 L675.12,450.60  '/>	<g transform="translate(138.84,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,396.90 L685.62,396.90  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,396.90 L159.13,396.90 M685.62,396.90 L675.12,396.90  '/>	<g transform="translate(138.84,401.45)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,343.20 L685.62,343.20  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,343.20 L159.13,343.20 M685.62,343.20 L675.12,343.20  '/>	<g transform="translate(138.84,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,289.50 L685.62,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,289.50 L159.13,289.50 M685.62,289.50 L675.12,289.50  '/>	<g transform="translate(138.84,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,235.81 L685.62,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,235.81 L159.13,235.81 M685.62,235.81 L675.12,235.81  '/>	<g transform="translate(138.84,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,182.11 L685.62,182.11  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,182.11 L159.13,182.11 M685.62,182.11 L675.12,182.11  '/>	<g transform="translate(138.84,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,128.41 L685.62,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,128.41 L159.13,128.41 M685.62,128.41 L675.12,128.41  '/>	<g transform="translate(138.84,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,74.71 L685.62,74.71  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,74.71 L159.13,74.71 M685.62,74.71 L675.12,74.71  '/>	<g transform="translate(138.84,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,21.01 L685.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,21.01 L159.13,21.01 M685.62,21.01 L675.12,21.01  '/>	<g transform="translate(138.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,558.00 L148.63,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,558.00 L148.63,547.50 M148.63,21.01 L148.63,31.51  '/>	<g transform="translate(148.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M202.33,558.00 L202.33,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M202.33,558.00 L202.33,547.50 M202.33,21.01 L202.33,31.51  '/>	<g transform="translate(202.33,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M256.03,558.00 L256.03,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M256.03,558.00 L256.03,547.50 M256.03,21.01 L256.03,31.51  '/>	<g transform="translate(256.03,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M309.73,558.00 L309.73,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M309.73,558.00 L309.73,547.50 M309.73,21.01 L309.73,31.51  '/>	<g transform="translate(309.73,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M363.43,558.00 L363.43,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M363.43,558.00 L363.43,547.50 M363.43,21.01 L363.43,31.51  '/>	<g transform="translate(363.43,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M417.13,558.00 L417.13,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M417.13,558.00 L417.13,547.50 M417.13,21.01 L417.13,31.51  '/>	<g transform="translate(417.13,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M470.82,558.00 L470.82,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M470.82,558.00 L470.82,547.50 M470.82,21.01 L470.82,31.51  '/>	<g transform="translate(470.82,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M524.52,558.00 L524.52,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M524.52,558.00 L524.52,547.50 M524.52,21.01 L524.52,31.51  '/>	<g transform="translate(524.52,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.4</text>
+	</g>
+</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M578.22,558.00 L578.22,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M578.22,558.00 L578.22,547.50 M578.22,21.01 L578.22,31.51  '/>	<g transform="translate(578.22,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.6</text>
+	</g>
+</g>
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+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M631.92,558.00 L631.92,31.51 L631.92,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+	<path stroke='black'  d='M631.92,558.00 L631.92,547.50 M631.92,21.01 L631.92,31.51  '/>	<g transform="translate(631.92,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.8</text>
+	</g>
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+		<text> 1</text>
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+</g>
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+	<path stroke='black'  d='M148.63,21.01 L148.63,558.00 L685.62,558.00 L685.62,21.01 L148.63,21.01 Z  '/></g>
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diff --git a/guide/guide-6.svg b/guide/guide-6.svg
new file mode 100644
index 0000000..99c8536
--- /dev/null
+++ b/guide/guide-6.svg
@@ -0,0 +1,490 @@
+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
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+<rect x="0" y="0" width="800" height="600" fill="none"/>
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+	<circle id='gpDot' r='0.5' stroke-width='0.5' stroke='currentColor'/>
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+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
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+	<circle id='gpPt5' stroke-width='0.190' stroke='currentColor' cx='0' cy='0' r='1'/>
+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
+	<use xlink:href='#gpPt9' id='gpPt10' fill='currentColor' stroke='none'/>
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+	<use xlink:href='#gpPt11' id='gpPt12' fill='currentColor' stroke='none'/>
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+	<filter id='textbox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
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+	<filter id='greybox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
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+</defs>
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+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,558.00 L685.62,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,558.00 L159.13,558.00 M685.62,558.00 L675.12,558.00  '/>	<g transform="translate(138.84,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,504.30 L685.62,504.30  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,504.30 L159.13,504.30 M685.62,504.30 L675.12,504.30  '/>	<g transform="translate(138.84,508.85)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,450.60 L685.62,450.60  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,450.60 L159.13,450.60 M685.62,450.60 L675.12,450.60  '/>	<g transform="translate(138.84,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,396.90 L685.62,396.90  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,396.90 L159.13,396.90 M685.62,396.90 L675.12,396.90  '/>	<g transform="translate(138.84,401.45)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,343.20 L685.62,343.20  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,343.20 L159.13,343.20 M685.62,343.20 L675.12,343.20  '/>	<g transform="translate(138.84,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,289.50 L685.62,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,289.50 L159.13,289.50 M685.62,289.50 L675.12,289.50  '/>	<g transform="translate(138.84,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,235.81 L685.62,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,235.81 L159.13,235.81 M685.62,235.81 L675.12,235.81  '/>	<g transform="translate(138.84,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,182.11 L685.62,182.11  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,182.11 L159.13,182.11 M685.62,182.11 L675.12,182.11  '/>	<g transform="translate(138.84,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,128.41 L685.62,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,128.41 L159.13,128.41 M685.62,128.41 L675.12,128.41  '/>	<g transform="translate(138.84,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,74.71 L685.62,74.71  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,74.71 L159.13,74.71 M685.62,74.71 L675.12,74.71  '/>	<g transform="translate(138.84,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M148.63,21.01 L685.62,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,21.01 L159.13,21.01 M685.62,21.01 L675.12,21.01  '/>	<g transform="translate(138.84,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M148.63,558.00 L148.63,547.50 M148.63,21.01 L148.63,31.51  '/>	<g transform="translate(148.63,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
+	</g>
+</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M202.33,558.00 L202.33,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M202.33,558.00 L202.33,547.50 M202.33,21.01 L202.33,31.51  '/>	<g transform="translate(202.33,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M256.03,558.00 L256.03,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M256.03,558.00 L256.03,547.50 M256.03,21.01 L256.03,31.51  '/>	<g transform="translate(256.03,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.6</text>
+	</g>
+</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M309.73,558.00 L309.73,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M309.73,558.00 L309.73,547.50 M309.73,21.01 L309.73,31.51  '/>	<g transform="translate(309.73,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M363.43,558.00 L363.43,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M363.43,558.00 L363.43,547.50 M363.43,21.01 L363.43,31.51  '/>	<g transform="translate(363.43,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M417.13,558.00 L417.13,547.50 M417.13,21.01 L417.13,31.51  '/>	<g transform="translate(417.13,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M470.82,558.00 L470.82,547.50 M470.82,21.01 L470.82,31.51  '/>	<g transform="translate(470.82,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M524.52,558.00 L524.52,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M524.52,558.00 L524.52,547.50 M524.52,21.01 L524.52,31.51  '/>	<g transform="translate(524.52,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.4</text>
+	</g>
+</g>
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+</g>
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+</g>
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+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M578.22,558.00 L578.22,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M578.22,558.00 L578.22,547.50 M578.22,21.01 L578.22,31.51  '/>	<g transform="translate(578.22,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.6</text>
+	</g>
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+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M631.92,558.00 L631.92,31.51 L631.92,21.01  '/></g>
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+</g>
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+	<path stroke='black'  d='M631.92,558.00 L631.92,547.50 M631.92,21.01 L631.92,31.51  '/>	<g transform="translate(631.92,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.8</text>
+	</g>
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+		<text> 1</text>
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diff --git a/guide/guide-7.svg b/guide/guide-7.svg
new file mode 100644
index 0000000..e45bca5
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+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
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+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,558.00 L635.10,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,558.00 L108.60,558.00 M635.10,558.00 L624.60,558.00  '/>	<g transform="translate(88.31,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,504.30 L635.10,504.30  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,504.30 L108.60,504.30 M635.10,504.30 L624.60,504.30  '/>	<g transform="translate(88.31,508.85)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,450.60 L108.60,450.60 M635.10,450.60 L624.60,450.60  '/>	<g transform="translate(88.31,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.6</text>
+	</g>
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+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,396.90 L635.10,396.90  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,396.90 L108.60,396.90 M635.10,396.90 L624.60,396.90  '/>	<g transform="translate(88.31,401.45)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,343.20 L635.10,343.20  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,343.20 L108.60,343.20 M635.10,343.20 L624.60,343.20  '/>	<g transform="translate(88.31,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,289.50 L635.10,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,289.50 L108.60,289.50 M635.10,289.50 L624.60,289.50  '/>	<g transform="translate(88.31,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,235.81 L635.10,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,235.81 L108.60,235.81 M635.10,235.81 L624.60,235.81  '/>	<g transform="translate(88.31,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,182.11 L635.10,182.11  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,182.11 L108.60,182.11 M635.10,182.11 L624.60,182.11  '/>	<g transform="translate(88.31,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.4</text>
+	</g>
+</g>
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+</g>
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+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,128.41 L635.10,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,128.41 L108.60,128.41 M635.10,128.41 L624.60,128.41  '/>	<g transform="translate(88.31,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,74.71 L635.10,74.71  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,74.71 L108.60,74.71 M635.10,74.71 L624.60,74.71  '/>	<g transform="translate(88.31,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,21.01 L635.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,21.01 L108.60,21.01 M635.10,21.01 L624.60,21.01  '/>	<g transform="translate(88.31,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,558.00 L98.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,558.00 L98.10,547.50 M98.10,21.01 L98.10,31.51  '/>	<g transform="translate(98.10,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M151.80,558.00 L151.80,547.50 M151.80,21.01 L151.80,31.51  '/>	<g transform="translate(151.80,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M205.50,558.00 L205.50,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M205.50,558.00 L205.50,547.50 M205.50,21.01 L205.50,31.51  '/>	<g transform="translate(205.50,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M259.20,558.00 L259.20,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M259.20,558.00 L259.20,547.50 M259.20,21.01 L259.20,31.51  '/>	<g transform="translate(259.20,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M312.90,558.00 L312.90,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M312.90,558.00 L312.90,547.50 M312.90,21.01 L312.90,31.51  '/>	<g transform="translate(312.90,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M366.60,558.00 L366.60,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M366.60,558.00 L366.60,547.50 M366.60,21.01 L366.60,31.51  '/>	<g transform="translate(366.60,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M420.30,558.00 L420.30,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M420.30,558.00 L420.30,547.50 M420.30,21.01 L420.30,31.51  '/>	<g transform="translate(420.30,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M474.00,558.00 L474.00,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M474.00,558.00 L474.00,547.50 M474.00,21.01 L474.00,31.51  '/>	<g transform="translate(474.00,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M527.70,558.00 L527.70,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M527.70,558.00 L527.70,547.50 M527.70,21.01 L527.70,31.51  '/>	<g transform="translate(527.70,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M581.40,558.00 L581.40,31.51 L581.40,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M581.40,558.00 L581.40,547.50 M581.40,21.01 L581.40,31.51  '/>	<g transform="translate(581.40,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.8</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M635.10,558.00 L635.10,547.50 M635.10,21.01 L635.10,31.51  '/>	<g transform="translate(635.10,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 1</text>
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+	<path stroke='black'  d='M98.10,21.01 L98.10,558.00 L635.10,558.00 L635.10,21.01 L98.10,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+	<path stroke='black'  d='M675.37,558.00 L664.87,558.00  '/>	<g transform="translate(685.16,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 0</text>
+	</g>
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+		<text> 50</text>
+	</g>
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+	<path stroke='black'  d='M648.52,490.88 L659.02,490.88 M675.37,423.76 L664.87,423.76  '/>	<g transform="translate(685.16,428.31)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 100</text>
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+		<text> 150</text>
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+		<text> 200</text>
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+		<text> 250</text>
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+		<text> 300</text>
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+		<text> 350</text>
+	</g>
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+		<text> 400</text>
+	</g>
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+	<path stroke='black'  d='M648.52,21.01 L659.02,21.01  '/></g>
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+</svg>
+
diff --git a/guide/guide-8.svg b/guide/guide-8.svg
new file mode 100644
index 0000000..74e8974
--- /dev/null
+++ b/guide/guide-8.svg
@@ -0,0 +1,669 @@
+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
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+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
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+	<filter id='textbox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
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+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
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+</defs>
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+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,558.00 L635.10,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,558.00 L108.60,558.00 M635.10,558.00 L624.60,558.00  '/>	<g transform="translate(88.31,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,504.30 L635.10,504.30  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,504.30 L108.60,504.30 M635.10,504.30 L624.60,504.30  '/>	<g transform="translate(88.31,508.85)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,450.60 L635.10,450.60  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,450.60 L108.60,450.60 M635.10,450.60 L624.60,450.60  '/>	<g transform="translate(88.31,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,396.90 L635.10,396.90  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,396.90 L108.60,396.90 M635.10,396.90 L624.60,396.90  '/>	<g transform="translate(88.31,401.45)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,343.20 L635.10,343.20  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,343.20 L108.60,343.20 M635.10,343.20 L624.60,343.20  '/>	<g transform="translate(88.31,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,289.50 L635.10,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,289.50 L108.60,289.50 M635.10,289.50 L624.60,289.50  '/>	<g transform="translate(88.31,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,235.81 L635.10,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,235.81 L108.60,235.81 M635.10,235.81 L624.60,235.81  '/>	<g transform="translate(88.31,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,182.11 L635.10,182.11  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,182.11 L108.60,182.11 M635.10,182.11 L624.60,182.11  '/>	<g transform="translate(88.31,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,128.41 L635.10,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,128.41 L108.60,128.41 M635.10,128.41 L624.60,128.41  '/>	<g transform="translate(88.31,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,74.71 L635.10,74.71  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,74.71 L108.60,74.71 M635.10,74.71 L624.60,74.71  '/>	<g transform="translate(88.31,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,21.01 L635.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,21.01 L108.60,21.01 M635.10,21.01 L624.60,21.01  '/>	<g transform="translate(88.31,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,558.00 L98.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,558.00 L98.10,547.50 M98.10,21.01 L98.10,31.51  '/>	<g transform="translate(98.10,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M151.80,558.00 L151.80,547.50 M151.80,21.01 L151.80,31.51  '/>	<g transform="translate(151.80,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M205.50,558.00 L205.50,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M205.50,558.00 L205.50,547.50 M205.50,21.01 L205.50,31.51  '/>	<g transform="translate(205.50,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M259.20,558.00 L259.20,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M259.20,558.00 L259.20,547.50 M259.20,21.01 L259.20,31.51  '/>	<g transform="translate(259.20,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M312.90,558.00 L312.90,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M312.90,558.00 L312.90,547.50 M312.90,21.01 L312.90,31.51  '/>	<g transform="translate(312.90,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M366.60,558.00 L366.60,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M366.60,558.00 L366.60,547.50 M366.60,21.01 L366.60,31.51  '/>	<g transform="translate(366.60,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M420.30,558.00 L420.30,547.50 M420.30,21.01 L420.30,31.51  '/>	<g transform="translate(420.30,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M474.00,558.00 L474.00,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M474.00,558.00 L474.00,547.50 M474.00,21.01 L474.00,31.51  '/>	<g transform="translate(474.00,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M527.70,558.00 L527.70,73.51 M527.70,31.51 L527.70,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M527.70,558.00 L527.70,547.50 M527.70,21.01 L527.70,31.51  '/>	<g transform="translate(527.70,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M581.40,558.00 L581.40,73.51 M581.40,31.51 L581.40,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M581.40,558.00 L581.40,547.50 M581.40,21.01 L581.40,31.51  '/>	<g transform="translate(581.40,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M635.10,558.00 L635.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M635.10,558.00 L635.10,547.50 M635.10,21.01 L635.10,31.51  '/>	<g transform="translate(635.10,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,21.01 L98.10,558.00 L635.10,558.00 L635.10,21.01 L98.10,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+	<g transform="translate(556.07,46.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>circle</text>
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+	</g>
+	<g id="gnuplot_plot_2" ><title>gnuplot_plot_2</title>
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+	<g transform="translate(556.07,67.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>ellipse</text>
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+</g>
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+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,356.63 L659.02,356.63 M675.37,289.51 L664.87,289.51  '/>	<g transform="translate(685.16,294.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 200</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,289.51 L659.02,289.51 M675.37,222.39 L664.87,222.39  '/>	<g transform="translate(685.16,226.94)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 250</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,222.39 L659.02,222.39 M675.37,155.26 L664.87,155.26  '/>	<g transform="translate(685.16,159.81)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 300</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,155.26 L659.02,155.26 M675.37,88.14 L664.87,88.14  '/>	<g transform="translate(685.16,92.69)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 350</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,88.14 L659.02,88.14 M675.37,21.01 L664.87,21.01  '/>	<g transform="translate(685.16,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 400</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,21.01 L659.02,21.01  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+</g>
+</svg>
+
diff --git a/guide/guide-9.svg b/guide/guide-9.svg
new file mode 100644
index 0000000..74e8974
--- /dev/null
+++ b/guide/guide-9.svg
@@ -0,0 +1,669 @@
+<?xml version="1.0" encoding="utf-8"  standalone="no"?>
+<svg 
+ width="800" height="600"
+ viewBox="0 0 800 600"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+>
+
+<title>Gnuplot</title>
+<desc>Produced by GNUPLOT 5.4 patchlevel 1 </desc>
+
+<g id="gnuplot_canvas">
+
+<rect x="0" y="0" width="800" height="600" fill="none"/>
+<defs>
+
+	<circle id='gpDot' r='0.5' stroke-width='0.5' stroke='currentColor'/>
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+	<path id='gpPt1' stroke-width='0.190' stroke='currentColor' d='M-1,-1 L1,1 M1,-1 L-1,1'/>
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+	<circle id='gpPt5' stroke-width='0.190' stroke='currentColor' cx='0' cy='0' r='1'/>
+	<use xlink:href='#gpPt5' id='gpPt6' fill='currentColor' stroke='none'/>
+	<path id='gpPt7' stroke-width='0.190' stroke='currentColor' d='M0,-1.33 L-1.33,0.67 L1.33,0.67 z'/>
+	<use xlink:href='#gpPt7' id='gpPt8' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt7' id='gpPt9' stroke='currentColor' transform='rotate(180)'/>
+	<use xlink:href='#gpPt9' id='gpPt10' fill='currentColor' stroke='none'/>
+	<use xlink:href='#gpPt3' id='gpPt11' stroke='currentColor' transform='rotate(45)'/>
+	<use xlink:href='#gpPt11' id='gpPt12' fill='currentColor' stroke='none'/>
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+	<filter id='textbox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='white' flood-opacity='1' result='bgnd'/>
+	  <feComposite in='SourceGraphic' in2='bgnd' operator='atop'/>
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+	<filter id='greybox' filterUnits='objectBoundingBox' x='0' y='0' height='1' width='1'>
+	  <feFlood flood-color='lightgrey' flood-opacity='1' result='grey'/>
+	  <feComposite in='SourceGraphic' in2='grey' operator='atop'/>
+	</filter>
+</defs>
+<g fill="none" color="white" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,558.00 L635.10,558.00  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,558.00 L108.60,558.00 M635.10,558.00 L624.60,558.00  '/>	<g transform="translate(88.31,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,504.30 L635.10,504.30  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,504.30 L108.60,504.30 M635.10,504.30 L624.60,504.30  '/>	<g transform="translate(88.31,508.85)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,450.60 L635.10,450.60  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,450.60 L108.60,450.60 M635.10,450.60 L624.60,450.60  '/>	<g transform="translate(88.31,455.15)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,396.90 L635.10,396.90  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,396.90 L108.60,396.90 M635.10,396.90 L624.60,396.90  '/>	<g transform="translate(88.31,401.45)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,343.20 L635.10,343.20  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,343.20 L108.60,343.20 M635.10,343.20 L624.60,343.20  '/>	<g transform="translate(88.31,347.75)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,289.50 L635.10,289.50  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,289.50 L108.60,289.50 M635.10,289.50 L624.60,289.50  '/>	<g transform="translate(88.31,294.05)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,235.81 L635.10,235.81  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,235.81 L108.60,235.81 M635.10,235.81 L624.60,235.81  '/>	<g transform="translate(88.31,240.36)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,182.11 L635.10,182.11  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,182.11 L108.60,182.11 M635.10,182.11 L624.60,182.11  '/>	<g transform="translate(88.31,186.66)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,128.41 L635.10,128.41  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,128.41 L108.60,128.41 M635.10,128.41 L624.60,128.41  '/>	<g transform="translate(88.31,132.96)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,74.71 L635.10,74.71  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,74.71 L108.60,74.71 M635.10,74.71 L624.60,74.71  '/>	<g transform="translate(88.31,79.26)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,21.01 L635.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,21.01 L108.60,21.01 M635.10,21.01 L624.60,21.01  '/>	<g transform="translate(88.31,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M98.10,558.00 L98.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,558.00 L98.10,547.50 M98.10,21.01 L98.10,31.51  '/>	<g transform="translate(98.10,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M151.80,558.00 L151.80,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M151.80,558.00 L151.80,547.50 M151.80,21.01 L151.80,31.51  '/>	<g transform="translate(151.80,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.8</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M205.50,558.00 L205.50,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M205.50,558.00 L205.50,547.50 M205.50,21.01 L205.50,31.51  '/>	<g transform="translate(205.50,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M259.20,558.00 L259.20,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M259.20,558.00 L259.20,547.50 M259.20,21.01 L259.20,31.51  '/>	<g transform="translate(259.20,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
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+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M312.90,558.00 L312.90,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M312.90,558.00 L312.90,547.50 M312.90,21.01 L312.90,31.51  '/>	<g transform="translate(312.90,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text>-0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M366.60,558.00 L366.60,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M366.60,558.00 L366.60,547.50 M366.60,21.01 L366.60,31.51  '/>	<g transform="translate(366.60,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M420.30,558.00 L420.30,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M420.30,558.00 L420.30,547.50 M420.30,21.01 L420.30,31.51  '/>	<g transform="translate(420.30,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.2</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M474.00,558.00 L474.00,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M474.00,558.00 L474.00,547.50 M474.00,21.01 L474.00,31.51  '/>	<g transform="translate(474.00,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.4</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M527.70,558.00 L527.70,73.51 M527.70,31.51 L527.70,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M527.70,558.00 L527.70,547.50 M527.70,21.01 L527.70,31.51  '/>	<g transform="translate(527.70,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.6</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M581.40,558.00 L581.40,73.51 M581.40,31.51 L581.40,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M581.40,558.00 L581.40,547.50 M581.40,21.01 L581.40,31.51  '/>	<g transform="translate(581.40,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 0.8</text>
+	</g>
+</g>
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+</g>
+<g fill="none" color="black" stroke="black" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="gray" stroke="currentColor" stroke-width="0.50" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='gray' stroke-dasharray='2,4' class="gridline"  d='M635.10,558.00 L635.10,21.01  '/></g>
+<g fill="none" color="gray" stroke="gray" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M635.10,558.00 L635.10,547.50 M635.10,21.01 L635.10,31.51  '/>	<g transform="translate(635.10,583.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="middle">
+		<text> 1</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M98.10,21.01 L98.10,558.00 L635.10,558.00 L635.10,21.01 L98.10,21.01 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+	<g id="gnuplot_plot_1" ><title>gnuplot_plot_1</title>
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+	<g transform="translate(556.07,46.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="end">
+		<text>circle</text>
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+	<g id="gnuplot_plot_2" ><title>gnuplot_plot_2</title>
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+		<text>ellipse</text>
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+		<polygon fill = 'rgb(250, 226,   0)' points = '648.52,41.99 675.37,41.99 675.37,37.79 648.52,37.79 '/>
+		<polygon fill = 'rgb(251, 232,   0)' points = '648.52,37.80 675.37,37.80 675.37,33.59 648.52,33.59 '/>
+		<polygon fill = 'rgb(252, 237,   0)' points = '648.52,33.60 675.37,33.60 675.37,29.40 648.52,29.40 '/>
+		<polygon fill = 'rgb(253, 243,   0)' points = '648.52,29.41 675.37,29.41 675.37,25.20 648.52,25.20 '/>
+		<polygon fill = 'rgb(254, 249,   0)' points = '648.52,25.21 675.37,25.21 675.37,21.01 648.52,21.01 '/>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,558.00 L675.37,558.00 L675.37,21.01 L648.52,21.01 L648.52,558.00 Z  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M675.37,558.00 L664.87,558.00  '/>	<g transform="translate(685.16,562.55)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 0</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,558.00 L659.02,558.00 M675.37,490.88 L664.87,490.88  '/>	<g transform="translate(685.16,495.43)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 50</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,490.88 L659.02,490.88 M675.37,423.76 L664.87,423.76  '/>	<g transform="translate(685.16,428.31)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 100</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,423.76 L659.02,423.76 M675.37,356.63 L664.87,356.63  '/>	<g transform="translate(685.16,361.18)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 150</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,356.63 L659.02,356.63 M675.37,289.51 L664.87,289.51  '/>	<g transform="translate(685.16,294.06)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 200</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,289.51 L659.02,289.51 M675.37,222.39 L664.87,222.39  '/>	<g transform="translate(685.16,226.94)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 250</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,222.39 L659.02,222.39 M675.37,155.26 L664.87,155.26  '/>	<g transform="translate(685.16,159.81)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 300</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,155.26 L659.02,155.26 M675.37,88.14 L664.87,88.14  '/>	<g transform="translate(685.16,92.69)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 350</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,88.14 L659.02,88.14 M675.37,21.01 L664.87,21.01  '/>	<g transform="translate(685.16,25.56)" stroke="none" fill="black" font-family="Arial" font-size="14.00"  text-anchor="start">
+		<text> 400</text>
+	</g>
+</g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+	<path stroke='black'  d='M648.52,21.01 L659.02,21.01  '/></g>
+<g fill="none" color="black" stroke="currentColor" stroke-width="1.00" stroke-linecap="butt" stroke-linejoin="miter">
+</g>
+</g>
+</svg>
+
diff --git a/guide/guide.org b/guide/guide.org
new file mode 100644
index 0000000..0d6b2e8
--- /dev/null
+++ b/guide/guide.org
@@ -0,0 +1,670 @@
+This is a tutorial and gallery demonstrating =feedgnuplot= usage. The
+[[https://github.com/dkogan/feedgnuplot/][documentation]] provides a complete reference, and [[https://github.com/dkogan/feedgnuplot/#recipes][application-specific usage
+examples]]. The capabilities of gnuplot itself are demonstrated at [[http://www.gnuplot.info/demo/][its demo page]].
+
+* Tutorial
+First, a trivial plot: let's plot a sinusoid
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE 'say sin($_/5.)' | \
+feedgnuplot
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-1.svg]]
+
+This was a trivial plot, and was trivially-easy to make: we gave the tool one
+column of data with no specific instructions, and we got a plot.
+
+The interpretation of the input data is controlled by two arguments: ==--domain=
+and =--dataid=. Here we passed neither, so each line of input is interpreted as
+=y0 y1 y2...= with sequential integers (0, 1, 2, ...) used for the =x=
+coordinate. Let's pass in more than one =y= per line to plot a sine and a cosine
+together:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE '$th = $_/100.*2.*3.14159;
+          $s  = sin($th);
+          $c  = cos($th);
+          say "$c $s"' | \
+feedgnuplot --lines --points
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-2.svg]]
+
+Here I also passed =--lines --points= to make more legible plots.
+
+Note that, the lines may have different numbers of points. To plot the cosine
+from every line, but the sine from every 5th line:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE '$th = $_/100.*2.*3.14159;
+          $s  = sin($th);
+          $c  = cos($th);
+          if($.%5) { say "$c";    }
+          else     { say "$c $s"; }' | \
+feedgnuplot --lines --points
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-3.svg]]
+
+Each =y= is referred to as a "dataset" or "curve" in the code and documentation.
+
+With =--domain=, the =x= values are read from the data instead of simply
+encoding line numbers: each line of input is interpreted as =x y0 y1 y2...=.
+Let's plot =sin(theta)= vs. =cos(theta)=, i.e. a circle:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE '$th = $_/100.*2.*3.14159;
+          $s  = sin($th);
+          $c  = cos($th);
+          say "$c $s"' | \
+feedgnuplot --lines --points --domain
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-4.svg]]
+
+Hmmm. We asked for a circle, but this looks more like an ellipse. Why? Because
+gnuplot is autoscaling the =x= and =y= axes independently to fill the plot window.
+We can scale the axes /together/ by passing =--square=, and we get a circle:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE '$th = $_/100.*2.*3.14159;
+          $s  = sin($th);
+          $c  = cos($th);
+          say "$c $s"' | \
+feedgnuplot --lines --points --domain --square
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-5.svg]]
+
+Again, we can have multiple =y= in each line, and each line may have a different
+number of =y=. Let's plot a circle /and/ an ellipse, sampled more coarsely:
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE '$th = $_/100.*2.*3.14159;
+          $s  = sin($th);
+          $c  = cos($th);
+          if($.%5) { say "$c $s"; }
+          else     { $s2 = $s/2;
+                     say "$c $s $s2"; }' | \
+feedgnuplot --lines --points --domain --square
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-6.svg]]
+
+We just plotted something where each point is represented by 2 values: =x= and
+=y=. When making 2D plots, this is the most common case, but others are
+possible. What if we want to color-code our points using another column of data?
+We feed in the new column, and we tell =feedgnuplot= that we now have /3/ values
+per point (the tuple size), and we tell =gnuplot= how we want this plot to be
+made. Color-coding by the angle, in degrees:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE '$thdeg = $_/100.*360.;
+          $th = $_/100.*2.*3.14159;
+          $s  = sin($th);
+          $c  = cos($th);
+          say "$c $s $thdeg";' | \
+feedgnuplot --domain --square \
+            --tuplesizeall 3  \
+            --styleall 'with linespoints palette'
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-7.svg]]
+
+Here we said that /all/ the datasets have 3 values per point. And that /all/ the
+datasets should be plotted with that particular style. The styles are strings
+that are passed on to =gnuplot= verbatim. So the full power of =gnuplot= is
+available, and there's nothing =feedgnuplot=-specific to learn. =gnuplot= has
+plenty of documentation about styling details.
+
+The above =--styleall= argument may be identically replaced with a shorthand:
+
+#+BEGIN_EXAMPLE
+--with 'points palette'
+#+END_EXAMPLE
+
+Note that the =--lines --points= specify the /default/ style only, so these
+options do nothing here, and if we want lines /and/ points, we ask for those in
+the style:
+
+#+BEGIN_EXAMPLE
+--with 'linespoints palette'
+#+END_EXAMPLE
+
+The styles and tuple sizes can be different for each dataset. For instance, to
+apply the colors only to the circle (dataset 0), leaving the ellipse (dataset 1)
+with the default tuple size and style:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE '$thdeg = $_/100.*360.;
+          $th = $_/100.*2.*3.14159;
+          $s=sin($th); $c=cos($th);
+          if($.%5) { say "$c $s $thdeg" }
+          else     { $s2 = $s/2;
+                     say "$c $s $thdeg $s2"; }' | \
+feedgnuplot --lines --points --domain --square \
+            --tuplesize 0 3   \
+            --style     0 'with points palette' \
+            --legend    0 'circle' \
+            --legend    1 'ellipse'
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-8.svg]]
+
+Here we also asked for dataset labels to make it clear to the viewer what's
+what.
+
+The other significant option involved in the interpretation of data is
+=--dataid=. This labels each dataset in the data, so instead of referring to
+dataset =0=, you could refer to dataset =circle=. With =--domain --dataid=, each
+line of input is interpreted as =x id0 y0 id1 y1...=, with the number of =y= in
+each dataset reflecting the tuple size. Naturally, =--dataid= without =--domain=
+is identical, except without the leading =x=. The previous plot can be
+reproduced with =--dataid=:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE '$thdeg = $_/100.*360.;
+          $th = $_/100.*2.*3.14159;
+          $s=sin($th); $c=cos($th);
+          if($.%5) { say "$c circle $s $thdeg" }
+          else     { $s2 = $s/2;
+                     say "$c circle $s $thdeg ellipse $s2"; }' | \
+feedgnuplot --lines --points --domain --dataid --square \
+            --tuplesize circle 3   \
+            --style     circle 'with points palette' \
+            --autolegend
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-9.svg]]
+
+Note that instead of labelling the datasets explicitly, we passed =--autolegend=
+to use the ID as the label for each dataset. This works without =--dataid= also,
+but the IDs are then the unhelpful sequential integers.
+
+Instead of identifying columns using explicit IDs inside the data stream (as
+with =--dataid=), it's possible to read [[https://www.github.com/dkogan/vnlog][vnlog]] data, which contains a single
+header line identifying the columns. For instance:
+
+#+BEGIN_SRC sh :results file link :exports both
+( echo '# th';
+  seq 100 | perl -nE 'say $_/100.*2.*3.14159;' ) | \
+vnl-filter -p 'c=cos(th),s=sin(th),th_deg=th*180./3.14159,s2=sin(th)/2' | \
+feedgnuplot --lines --points --domain --vnl --square \
+            --tuplesize s 3   \
+            --style     s 'with points palette' \
+            --legend s  circle \
+            --legend s2 ellipse
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-10.svg]]
+
+* Gallery
+This is a good overview of the syntax and of the data interpretation. Let's demo
+some fancy plots to serve as a cookbook.
+
+Since the actual plotting is handled by =gnuplot=, its documentation and [[http://www.gnuplot.info/demo/][demos]]
+are the primary reference on how to do stuff.
+
+** Line, point sizes, thicknesses, styles
+Most often, we're plotting lines or points. The most common styling keywords
+are:
+
+- =pt= (or equivalently =pointtype=)
+- =ps= (or equivalently =pointsize=)
+- =lt= (or equivalently =linetype=)
+- =lw= (or equivalently =linewidth=)
+- =lc= (or equivalently =linecolor=)
+- =dt= (or equivalently =dashtype=)
+
+For details about these and all other styles, see the =gnuplot= documentation.
+For instance, the first little bit of the docs about the different line widths:
+
+#+BEGIN_SRC sh :results output verbatim :exports both
+gnuplot -e 'help linewidth' | head -n 20
+#+END_SRC
+
+#+RESULTS:
+#+begin_example
+ Each terminal has a default set of line and point types, which can be seen
+ by using the command `test`.  `set style line` defines a set of line types
+ and widths and point types and sizes so that you can refer to them later by
+ an index instead of repeating all the information at each invocation.
+
+ Syntax:
+       set style line <index> default
+       set style line <index> {{linetype  | lt} <line_type> | <colorspec>}
+                              {{linecolor | lc} <colorspec>}
+                              {{linewidth | lw} <line_width>}
+                              {{pointtype | pt} <point_type>}
+                              {{pointsize | ps} <point_size>}
+                              {{pointinterval | pi} <interval>}
+                              {{pointnumber | pn} <max_symbols>}
+                              {{dashtype | dt} <dashtype>}
+                              {palette}
+       unset style line
+       show style line
+
+ `default` sets all line style parameters to those of the linetype with
+#+end_example
+
+gnuplot has a =test= command, which produces a demo of the various available
+styles. This documentation uses the =svg= terminal (what gnuplot calls a
+backend). So for the =svg= terminal, the various styles look like this:
+
+#+begin_src gnuplot :results file link :exports both :file gnuplot-terminal-test.svg
+test
+#+end_src
+
+#+RESULTS:
+[[file:gnuplot-terminal-test.svg]]
+
+So for instance if you plot =--with 'linespoints pt 4 dt 2 lc 7'= you'll get a
+red dashed line with square points. By default you'd be using one of the
+interactive graphical terminals (=x11= or =qt=), which would have largely
+similar styling.
+
+Let's make a plot with some variable colors and point sizes:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq -10 10 | \
+perl -nE '$, = " ";
+          say "parabola", $_*$_, abs($_)/2, $_*50;
+          say "line",     $_*3. + 30.;' | \
+feedgnuplot --dataid \
+            --tuplesize parabola 4   \
+            --style     parabola 'with points pointtype 7 pointsize variable palette' \
+            --style     line     'with lines lw 3 lc "red" dashtype 2' \
+            --set 'cbrange [-600:600]'
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-11.svg]]
+
+Here we used =--set= to set the range of the colorbar. =--set= (and =--unset=)
+map to the gnuplot =set= (and =--unset=) command.
+
+** Error bars
+As before, the =gnuplot= documentation has the styling details:
+
+#+BEGIN_SRC sh :results none :exports code
+gnuplot -e 'help xerrorbars'
+gnuplot -e 'help yerrorbars'
+gnuplot -e 'help xyerrorbars'
+#+END_SRC
+
+For brevity, I'm not including the contents of those help pages here. These tell
+us how to specify errorbars: how many columns to pass in, what they mean, etc.
+Example:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq -10 10 | \
+perl -nE '$, = " ";
+          chomp;
+          $x = $_;
+          $y = $x*$x * 10 + 20;
+          say $x+1, "parabola", $y;
+          say $x+1, "parabola_symmetric_xyerrorbars", $y, $x*$x/80, $x*$x/4;
+          say $x, "parabola_unsymmetric_xyerrorbars", $y, $x-$x*$x/80, $x+$x*$x/40, $y-$x*$x/4, $y+$x*$x/8;
+          say $x, "line_unsymmetric_yerrorbars", $x*20+500, 40;' | \
+feedgnuplot --domain --dataid \
+            --tuplesize parabola 2   \
+            --style     parabola "with lines" \
+            --tuplesize parabola_symmetric_xyerrorbars 4   \
+            --style     parabola_symmetric_xyerrorbars "with xyerrorbars" \
+            --legend    parabola_symmetric_xyerrorbars "using the 'x y xdelta ydelta' style" \
+            --tuplesize parabola_unsymmetric_xyerrorbars 6   \
+            --style     parabola_unsymmetric_xyerrorbars "with xyerrorbars" \
+            --legend    parabola_unsymmetric_xyerrorbars "using the 'x y xlow xhigh ylow yhigh' style" \
+            --tuplesize line_unsymmetric_yerrorbars 3   \
+            --style     line_unsymmetric_yerrorbars "with yerrorbars" \
+            --legend    line_unsymmetric_yerrorbars "using the 'x y ydelta' style" \
+            --xmin -10 --xmax 10 \
+            --set 'key box opaque'
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-12.svg]]
+
+** Polar coordinates
+See
+
+#+BEGIN_SRC sh :results none :exports code
+gnuplot -e 'help polar'
+#+END_SRC
+
+Let's plot a simple =rho = theta= spiral:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 100 | \
+perl -nE '$x = $_/10; \
+          say "$x $x"' | \
+feedgnuplot --domain       \
+            --with 'lines' \
+            --set 'polar'  \
+            --square
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-13.svg]]
+
+** Timestamps
+=feedgnuplot= can interpret data given as timestamps in an arbitrary format
+parseable with =strftime()=. Unlike everything else in =feedgnuplot=, these
+timestamps /may/ contain whitespace. For instance:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 5 | gawk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1}' | \
+feedgnuplot --domain \
+            --lines --points \
+            --timefmt '%d %b %Y %H:%M:%S' \
+            --xmin '20 Oct 2013 06:05:00' \
+            --xmax '20 Oct 2013 06:05:20'
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-14.svg]]
+
+=--timefmt= controls how to parse the /input/. The formatting of the /output/ is
+auto-selected by gnuplot, and sometimes we want to control it. To show the hour
+and minute and seconds on the x axis:
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 5 | gawk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1}' | \
+feedgnuplot --domain \
+            --lines --points \
+            --timefmt '%d %b %Y %H:%M:%S' \
+            --xmin '20 Oct 2013 06:05:00' \
+            --xmax '20 Oct 2013 06:05:20' \
+            --set 'format x "%H:%M:%S"'
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-15.svg]]
+
+** Labels
+Docs:
+
+#+BEGIN_SRC sh :results none :exports code
+gnuplot -e 'help labels'
+gnuplot -e 'help set label'
+#+END_SRC
+
+Basic example:
+
+#+BEGIN_SRC sh :results file link :exports both
+echo \
+    "1 1 aaa
+     2 3 bbb
+     4 5 ccc" | \
+feedgnuplot --domain          \
+            --with 'labels'   \
+            --tuplesizeall 3  \
+            --xmin 0 --xmax 5 \
+            --ymin 0 --ymax 6 \
+            --unset grid
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-16.svg]]
+
+More complex example (varied orientations and colors):
+
+#+BEGIN_SRC sh :results file link :exports both
+echo \
+    "1 1 aaa 0  10
+     2 3 bbb 30 18
+     4 5 ccc 90 20" | \
+feedgnuplot --domain          \
+            --with 'labels rotate variable textcolor palette' \
+            --tuplesizeall 5  \
+            --xmin 0 --xmax 5 \
+            --ymin 0 --ymax 6 \
+            --unset grid
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-17.svg]]
+
+** 3D plots
+We can plot in 3D by passing =--3d=. When plotting interactively, you can use
+the mouse to rotate the plot, and look at it from different directions.
+Otherwise, the viewing angle can be set with =--set 'view ...'=. See
+
+#+BEGIN_SRC sh :results none :exports code
+gnuplot -e 'help set view'
+#+END_SRC
+
+Unlike 2D plots, 3D plots have a 2-dimensional domain, and =--domain= is
+/required/. So each line is interpreted =x y z0 z1 z2...=.
+
+A double-helix with variable color and variable pointsize
+
+#+BEGIN_SRC sh :results file link :exports both
+seq 200 | \
+perl -nE '$, = " ";
+          $th = $_/10;
+          $z  = $_/40;
+          $c  = cos($th);
+          $s  = sin($th);
+          $size = 0.5 + abs($c);
+          $color = $z;
+          say  $c,  $s, 0, $z, $size, $color;
+          say -$c, -$s, 1, $z, $size, $color;' | \
+feedgnuplot --domain --dataid --3d \
+            --with 'points pointsize variable pointtype 7 palette' \
+            --tuplesizeall 5 \
+            --title "Double helix" \
+            --squarexy
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-18.svg]]
+
+** Histograms
+=gnuplot= (and =feedgnuplot=) has support for histograms. So we can give it
+data, and have it bin it for us. Pre-sorting the data is unnecessary. Let's look
+at the central limit theorem: we look at the distribution of sums of 10 uniform
+samples in [-1,1]: it should be normal-ish. And let's draw the expected perfect
+PDF on top (as an equation, evaluated by =gnuplot=).
+
+#+BEGIN_SRC sh :results file link :exports both
+N=20000;
+Nsum=10;
+binwidth=.1;
+seq $N | \
+perl -nE '$Nsum = '$Nsum';
+          $var  = '$Nsum' / 3.;
+          $s = 0; for $i (1..$Nsum) { $s += rand()*2-1; }
+          say $s/sqrt($var);' | \
+feedgnuplot --histo 0 --binwidth $binwidth \
+            --equation-above "($N * sqrt(2.*pi) * erf($binwidth/(2.*sqrt(2.)))) * \
+                              exp(-(x*x)/(2.)) / \
+                              sqrt(2.*pi) title \"Limit gaussian\" with lines lw 2"
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-19.svg]]
+
+If we want multiple histograms drawn on top of one another, the styling should
+be adjusted so that they both remain visible. Let's vary the size of the sum,
+and look at the effects: bigger sums should be more gaussian-like:
+
+#+BEGIN_SRC sh :results file link :exports both
+N=20000;
+binwidth=.1;
+for Nsum in 1 2 3; do
+  seq $N | \
+  perl -nE '$, = " ";
+            $Nsum = '$Nsum';
+            $var  = '$Nsum' / 3.;
+            $s = 0; for $i (1..$Nsum) { $s += rand()*2-1; }
+            say $Nsum,$s/sqrt($var);';
+done | \
+feedgnuplot --dataid --histo 1,2,3 --binwidth $binwidth \
+            --autolegend \
+            --style 1  'with boxes fill transparent solid 0.3 border lt -1' \
+            --style 2  'with boxes fill transparent pattern 4 border lt -1' \
+            --style 3  'with boxes fill transparent pattern 5 border lt -1' \
+            --equation-above "($N * sqrt(2.*pi) * erf($binwidth/(2.*sqrt(2.)))) * \
+                              exp(-(x*x)/(2.)) / \
+                              sqrt(2.*pi) title \"Limit gaussian\" with lines lw 2"
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-20.svg]]
+
+** Labeled bar charts
+=feedgnuplot= supports bar charts to be drawn with labels appearing in the data.
+These aren't "histograms", where gnuplot bins the data for us, but rather the
+data is given to us, ready to plot. We pass =--xticlabels= to indicate that the
+x-axis tic labels come from the data. This changes the interpretation of the
+input: with =--domain=, each line begins with =x label ....=. Without
+=--domain=, each line begins with =label ...=. This does /not/ affect the
+tuple size.
+
+Basic example without =--domain=:
+
+#+BEGIN_SRC sh :results file link :exports both
+echo "# x label a b
+       5  aaa   2 1
+       6  bbb   3 2
+      10  ccc   5 4
+      11  ddd   2 1" | \
+vnl-filter -p label,a,b | \
+feedgnuplot --vnl \
+            --xticlabels \
+            --style a 'with boxes fill pattern 4 border lt -1' \
+            --style b 'with boxes fill pattern 5 border lt -1' \
+            --ymin 0 --unset grid
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-21.svg]]
+
+We can also pass =--domain= to read the =x= positions from the data also:
+
+#+BEGIN_SRC sh :results file link :exports both
+echo "# x label a b
+       5  aaa   2 1
+       6  bbb   3 2
+      10  ccc   5 4
+      11  ddd   2 1" | \
+feedgnuplot --vnl --domain \
+            --xticlabels \
+            --style a 'with boxes fill pattern 4 border lt -1' \
+            --style b 'with boxes fill pattern 5 border lt -1' \
+            --ymin 0 --unset grid
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-22.svg]]
+
+And we can use gnuplot's clustering capabilities:
+
+#+BEGIN_SRC sh :results file link :exports both
+echo "# x label a b
+       5  aaa   2 1
+       6  bbb   3 2
+      10  ccc   5 4
+      11  ddd   2 1" | \
+vnl-filter -p label,a,b | \
+feedgnuplot --vnl \
+            --xticlabels \
+            --set 'style data histogram' \
+            --set 'style histogram cluster gap 2' \
+            --set 'style fill solid border lt -1' \
+            --autolegend \
+            --ymin 0 --unset grid
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-23.svg]]
+
+Or we can vertically stack the bars in each cluster:
+
+#+BEGIN_SRC sh :results file link :exports both
+echo "# x label a b
+       5  aaa   2 1
+       6  bbb   3 2
+      10  ccc   5 4
+      11  ddd   2 1" | \
+vnl-filter -p label,a,b | \
+feedgnuplot --vnl \
+            --xticlabels \
+            --set 'style data histogram' \
+            --set 'style histogram rowstacked' \
+            --set 'boxwidth 0.8' \
+            --set 'style fill solid border lt -1' \
+            --autolegend \
+            --ymin 0 --unset grid
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-24.svg]]
+
+Using =--xticlabels= to plot bars is probably the most common usage, but
+=--xticlabels= means /only/ that we read the x-axis tic labels from the data, so
+we can plot anything. For instance:
+
+#+BEGIN_SRC sh :results file link :exports both
+echo "# x label a b
+       5  aaa   2 1
+       6  bbb   3 2
+      10  ccc   5 4
+      11  ddd   2 1" | \
+feedgnuplot --vnl --domain \
+            --xticlabels \
+            --tuplesizeall 3 \
+            --with 'points pt 7 ps 2 palette' \
+            --xmin 4 --xmax 12 \
+            --ymin 0 --ymax 6 \
+            --unset grid
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-25.svg]]
+
+** Vector fields
+Documentation in gnuplot available like this:
+
+#+BEGIN_SRC sh :results none :exports code
+gnuplot -e 'help vectors'
+#+END_SRC
+
+The docs say that in 2D we want 4 columns: =x, y, xdelta, ydelta= and in 3D we
+want 6 columns: =x, y, z, xdelta, ydelta, zdelta=. And we can have a variable
+arrowstyle. A vector field in 2D:
+
+#+BEGIN_SRC sh :results file link :exports both
+perl -E '$, = " ";
+     for $x (-5..5) { for $y (-5..5) {
+       $r = sqrt($x*$x + $y*$y);
+       say $x, $y, $y/sqrt($r+0.1)*0.5, -$x/sqrt($r+0.1)*0.5;
+     } }' | \
+feedgnuplot --domain \
+            --tuplesizeall 4 \
+            --with 'vectors filled head' \
+            --square
+#+END_SRC
+
+#+RESULTS:
+[[file:guide-26.svg]]
diff --git a/t/3d-spiral-with-bounds-labels-square-xy-aspect-ratio.ref b/t/3d-spiral-with-bounds-labels-square-xy-aspect-ratio.ref
new file mode 100644
index 0000000..5164370
--- /dev/null
+++ b/t/3d-spiral-with-bounds-labels-square-xy-aspect-ratio.ref
@@ -0,0 +1,32 @@
+                                           *AA*                                                     
+                                               AA*A                                                 
+                                                   A                                                
+                                       +            A*A                                             
+                                  40   +-+             A                                            
+                                       |                A                                           
+                                  30   +-+               A                                          
+                                       |  AAAAA*          A                                         
+                                 z20   +-+AA    AA        A                                         
+                                       |   AA*    A*A    AA                                         
+                                       |      AA*AAA*AA*A                                           
+                                  10   +-+             AAA                                          
+                                   0   |                  A                                         
+                                       +-+                A                                         
+                                       |                  A                                         
+                                       |    +-                                                      
+                                       |   +-++-+                                                   
+                                       | ++-+   +-+--                                               
+                                       |++-+        +-+-                                            
+                                       +----            +-+  1                                      
+                                         + ----5         ++-+8                                      
+                                           + + ----     +--+.4                                      
+                                               + 0 --- +--+2                                        
+                                                    1.--0+6                                         
+                                                     ++++                                           
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
diff --git a/t/3d-spiral-with-bounds-labels.ref b/t/3d-spiral-with-bounds-labels.ref
new file mode 100644
index 0000000..be65ec3
--- /dev/null
+++ b/t/3d-spiral-with-bounds-labels.ref
@@ -0,0 +1,33 @@
+                                ***A****A****A****A***A**                                           
+                               *                         **A**                                      
+                                                              **A***A*                              
+                                                                      *A*                           
+                                                                         *A                         
+                                                                           *                        
+              +                                                            A                        
+         40   +-+              ***A***A****A****A***A**                    A                        
+              |             **A                        **A****A**         *A                        
+         30   +-+        A*A                                     *A**   *A                          
+              |          A                                           *AA                            
+        z20   +-+        AA*                                     **A*   *A*                         
+              |             A**A***A****A***A*****A***A****A***A*          A                        
+         10   |                                                            A                        
+              +-+                      -+----                             A                         
+          0   |                     -+--+  + ++----+--                                              
+              +-+               ---+--+           +   --++-----                                     
+              |              ---+--+                          ++---++---                            
+              |           -+--+-+                                       -++----+-      1            
+              |        -+--+  +                                                + ----+.8            
+              |    ---+--+                                                   -----+.6               
+              | ---+--+                                                   ---+.-+.4                 
+             -+-------------                                           ----+                        
+                 +  +   -1+ ---------                               ----+.2                         
+                         +   -0.5    ---------                  -----+.4                            
+                                     +   0.5  ---------      ---  -+.6                              
+                                                ++  1.5----+--+-+.8                                 
+                                                     +  +--++                                       
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
diff --git a/t/basic-line-plot-to-piped-hardcopy.ref b/t/basic-line-plot-to-piped-hardcopy.ref
new file mode 100644
index 0000000..f2eefd9
--- /dev/null
+++ b/t/basic-line-plot-to-piped-hardcopy.ref
@@ -0,0 +1,40 @@
+    5 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +       ** |   
+      |                                                                                   ***   |   
+      |                                                                                 **      |   
+  4.5 |-+                                                                            ***      +-|   
+      |                                                                            **           |   
+      |                                                                          **             |   
+      |                                                                       ***               |   
+      |                                                                     **                  |   
+    4 |-+                                                                *A*                  +-|   
+      |                                                                **                       |   
+      |                                                             ***                         |   
+      |                                                           **                            |   
+  3.5 |-+                                                      ***                            +-|   
+      |                                                     ***                                 |   
+      |                                                   **                                    |   
+      |                                                ***                                      |   
+      |                                              **                                         |   
+    3 |-+                                         *A*                                         +-|   
+      |                                         **                                              |   
+      |                                      ***                                                |   
+      |                                    **                                                   |   
+  2.5 |-+                               ***                                                   +-|   
+      |                               **                                                        |   
+      |                             **                                                          |   
+      |                          ***                                                            |   
+      |                        **                                                               |   
+    2 |-+                   *A*                                                               +-|   
+      |                   **                                                                    |   
+      |                ***                                                                      |   
+      |              **                                                                         |   
+  1.5 |-+         ***                                                                         +-|   
+      |        ***                                                                              |   
+      |      **                                                                                 |   
+      |   ***                                                                                   |   
+      | **       +           +          +          +          +           +          +          |   
+    1 +-----------------------------------------------------------------------------------------+   
+      1         1.5          2         2.5         3         3.5          4         4.5         5   
+                                                                                                    
+Wrote output to |cat
diff --git a/t/basic-line-plot-with-bounds-square-aspect-ratio.ref b/t/basic-line-plot-with-bounds-square-aspect-ratio.ref
new file mode 100644
index 0000000..e660bd5
--- /dev/null
+++ b/t/basic-line-plot-with-bounds-square-aspect-ratio.ref
@@ -0,0 +1,30 @@
+    +-------------------------------------------------------------------------------------------+   
+  5 |-++           +            +           +           +           +            +           ++-|   
+    |                                                                                           |   
+    |                                                                                          *|   
+  4 |-+                                                                                     *A*-|   
+    |                                                                                     **    |   
+    |                                                                                   **      |   
+  3 |-+                                                                               *A      +-|   
+    |                                                                               **          |   
+    |                                                                             **            |   
+  2 |-+                                                                         *A            +-|   
+    |                                                                         **                |   
+    |                                                                       **                  |   
+  1 |-+                                                                    A                  +-|   
+    |                                                                                           |   
+    |                                                                                           |   
+  0 |-+                                                                                       +-|   
+    |  +           +            +           +           +           +            +           +  |   
+    +-------------------------------------------------------------------------------------------+   
+      -10         -8           -6          -4          -2           0            2           4      
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
+                                                                                                    
diff --git a/t/basic-line-plot-with-bounds.ref b/t/basic-line-plot-with-bounds.ref
new file mode 100644
index 0000000..97df55a
--- /dev/null
+++ b/t/basic-line-plot-with-bounds.ref
@@ -0,0 +1,39 @@
+    +-------------------------------------------------------------------------------------------+   
+    |  +           +            +           +           +           +            +           +  |   
+    |                                                                                           |   
+  5 |-+                                                                                       +-|   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                          *|   
+    |                                                                                         * |   
+  4 |-+                                                                                      A+-|   
+    |                                                                                       *   |   
+    |                                                                                      *    |   
+    |                                                                                     *     |   
+    |                                                                                    *      |   
+    |                                                                                   *       |   
+  3 |-+                                                                                A      +-|   
+    |                                                                                 *         |   
+    |                                                                                *          |   
+    |                                                                               *           |   
+    |                                                                              *            |   
+    |                                                                             *             |   
+  2 |-+                                                                          A            +-|   
+    |                                                                           *               |   
+    |                                                                          *                |   
+    |                                                                         *                 |   
+    |                                                                        *                  |   
+    |                                                                       *                   |   
+  1 |-+                                                                    A                  +-|   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+  0 |-+                                                                                       +-|   
+    |                                                                                           |   
+    |  +           +            +           +           +           +            +           +  |   
+    +-------------------------------------------------------------------------------------------+   
+      -10         -8           -6          -4          -2           0            2           4      
+                                                                                                    
diff --git a/t/basic-line-plot.ref b/t/basic-line-plot.ref
new file mode 100644
index 0000000..06af9e9
--- /dev/null
+++ b/t/basic-line-plot.ref
@@ -0,0 +1,39 @@
+    5 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +       ** |   
+      |                                                                                   ***   |   
+      |                                                                                 **      |   
+  4.5 |-+                                                                            ***      +-|   
+      |                                                                            **           |   
+      |                                                                          **             |   
+      |                                                                       ***               |   
+      |                                                                     **                  |   
+    4 |-+                                                                *A*                  +-|   
+      |                                                                **                       |   
+      |                                                             ***                         |   
+      |                                                           **                            |   
+  3.5 |-+                                                      ***                            +-|   
+      |                                                     ***                                 |   
+      |                                                   **                                    |   
+      |                                                ***                                      |   
+      |                                              **                                         |   
+    3 |-+                                         *A*                                         +-|   
+      |                                         **                                              |   
+      |                                      ***                                                |   
+      |                                    **                                                   |   
+  2.5 |-+                               ***                                                   +-|   
+      |                               **                                                        |   
+      |                             **                                                          |   
+      |                          ***                                                            |   
+      |                        **                                                               |   
+    2 |-+                   *A*                                                               +-|   
+      |                   **                                                                    |   
+      |                ***                                                                      |   
+      |              **                                                                         |   
+  1.5 |-+         ***                                                                         +-|   
+      |        ***                                                                              |   
+      |      **                                                                                 |   
+      |   ***                                                                                   |   
+      | **       +           +          +          +          +           +          +          |   
+    1 +-----------------------------------------------------------------------------------------+   
+      1         1.5          2         2.5         3         3.5          4         4.5         5   
+                                                                                                    
diff --git a/t/basic-lines-only-plot.ref b/t/basic-lines-only-plot.ref
new file mode 100644
index 0000000..70b2f84
--- /dev/null
+++ b/t/basic-lines-only-plot.ref
@@ -0,0 +1,39 @@
+    5 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +       ** |   
+      |                                                                                   ***   |   
+      |                                                                                 **      |   
+  4.5 |-+                                                                            ***      +-|   
+      |                                                                            **           |   
+      |                                                                          **             |   
+      |                                                                       ***               |   
+      |                                                                     **                  |   
+    4 |-+                                                                ***                  +-|   
+      |                                                                **                       |   
+      |                                                             ***                         |   
+      |                                                           **                            |   
+  3.5 |-+                                                      ***                            +-|   
+      |                                                     ***                                 |   
+      |                                                   **                                    |   
+      |                                                ***                                      |   
+      |                                              **                                         |   
+    3 |-+                                         ***                                         +-|   
+      |                                         **                                              |   
+      |                                      ***                                                |   
+      |                                    **                                                   |   
+  2.5 |-+                               ***                                                   +-|   
+      |                               **                                                        |   
+      |                             **                                                          |   
+      |                          ***                                                            |   
+      |                        **                                                               |   
+    2 |-+                   ***                                                               +-|   
+      |                   **                                                                    |   
+      |                ***                                                                      |   
+      |              **                                                                         |   
+  1.5 |-+         ***                                                                         +-|   
+      |        ***                                                                              |   
+      |      **                                                                                 |   
+      |   ***                                                                                   |   
+      | **       +           +          +          +          +           +          +          |   
+    1 +-----------------------------------------------------------------------------------------+   
+      1         1.5          2         2.5         3         3.5          4         4.5         5   
+                                                                                                    
diff --git a/t/basic-points-only-plot.ref b/t/basic-points-only-plot.ref
new file mode 100644
index 0000000..e9728f8
--- /dev/null
+++ b/t/basic-points-only-plot.ref
@@ -0,0 +1,39 @@
+    5 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +          |   
+      |                                                                                         |   
+      |                                                                                         |   
+  4.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    4 |-+                                                                 A                   +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  3.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    3 |-+                                          A                                          +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  2.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    2 |-+                    A                                                                +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  1.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |          +           +          +          +          +           +          +          |   
+    1 +-----------------------------------------------------------------------------------------+   
+      1         1.5          2         2.5         3         3.5          4         4.5         5   
+                                                                                                    
diff --git a/t/basic-streaming-test-twice-as-fast.ref b/t/basic-streaming-test-twice-as-fast.ref
new file mode 100644
index 0000000..ee46dbf
--- /dev/null
+++ b/t/basic-streaming-test-twice-as-fast.ref
@@ -0,0 +1,78 @@
+    1 +-----------------------------------------------------------------------------------------+   
+      |                      +                     +                     +                      |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  0.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    0 |-+                                          A                                          +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+ -0.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                      +                     +                     +                      |   
+   -1 +-----------------------------------------------------------------------------------------+   
+     0.99                  0.995                   1                   1.005                   1.01 
+                                                                                                    
+    2 +-----------------------------------------------------------------------------------------+   
+      |                      +                     +                      +                  ** |   
+      |                                                                                   ***   |   
+      |                                                                                 **      |   
+      |                                                                              ***        |   
+      |                                                                            **           |   
+      |                                                                         ***             |   
+      |                                                                       **                |   
+      |                                                                    ***                  |   
+  1.5 |-+                                                                **                   +-|   
+      |                                                               ***                       |   
+      |                                                             **                          |   
+      |                                                          ***                            |   
+      |                                                        **                               |   
+      |                                                     ***                                 |   
+      |                                                   **                                    |   
+      |                                                ***                                      |   
+      |                                              **                                         |   
+    1 |-+                                         *A*                                         +-|   
+      |                                         **                                              |   
+      |                                      ***                                                |   
+      |                                    **                                                   |   
+      |                                 ***                                                     |   
+      |                               **                                                        |   
+      |                            ***                                                          |   
+      |                          **                                                             |   
+      |                       ***                                                               |   
+  0.5 |-+                   **                                                                +-|   
+      |                  ***                                                                    |   
+      |                **                                                                       |   
+      |             ***                                                                         |   
+      |           **                                                                            |   
+      |        ***                                                                              |   
+      |      **                                                                                 |   
+      |   ***                                                                                   |   
+      | **                   +                     +                      +                     |   
+    0 +-----------------------------------------------------------------------------------------+   
+      1                     1.5                    2                     2.5                    3   
+                                                                                                    
diff --git a/t/basic-streaming-test.ref b/t/basic-streaming-test.ref
new file mode 100644
index 0000000..ee46dbf
--- /dev/null
+++ b/t/basic-streaming-test.ref
@@ -0,0 +1,78 @@
+    1 +-----------------------------------------------------------------------------------------+   
+      |                      +                     +                     +                      |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  0.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    0 |-+                                          A                                          +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+ -0.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                      +                     +                     +                      |   
+   -1 +-----------------------------------------------------------------------------------------+   
+     0.99                  0.995                   1                   1.005                   1.01 
+                                                                                                    
+    2 +-----------------------------------------------------------------------------------------+   
+      |                      +                     +                      +                  ** |   
+      |                                                                                   ***   |   
+      |                                                                                 **      |   
+      |                                                                              ***        |   
+      |                                                                            **           |   
+      |                                                                         ***             |   
+      |                                                                       **                |   
+      |                                                                    ***                  |   
+  1.5 |-+                                                                **                   +-|   
+      |                                                               ***                       |   
+      |                                                             **                          |   
+      |                                                          ***                            |   
+      |                                                        **                               |   
+      |                                                     ***                                 |   
+      |                                                   **                                    |   
+      |                                                ***                                      |   
+      |                                              **                                         |   
+    1 |-+                                         *A*                                         +-|   
+      |                                         **                                              |   
+      |                                      ***                                                |   
+      |                                    **                                                   |   
+      |                                 ***                                                     |   
+      |                               **                                                        |   
+      |                            ***                                                          |   
+      |                          **                                                             |   
+      |                       ***                                                               |   
+  0.5 |-+                   **                                                                +-|   
+      |                  ***                                                                    |   
+      |                **                                                                       |   
+      |             ***                                                                         |   
+      |           **                                                                            |   
+      |        ***                                                                              |   
+      |      **                                                                                 |   
+      |   ***                                                                                   |   
+      | **                   +                     +                      +                     |   
+    0 +-----------------------------------------------------------------------------------------+   
+      1                     1.5                    2                     2.5                    3   
+                                                                                                    
diff --git a/t/basic-timefmt-plot.ref b/t/basic-timefmt-plot.ref
new file mode 100644
index 0000000..f9d7053
--- /dev/null
+++ b/t/basic-timefmt-plot.ref
@@ -0,0 +1,39 @@
+    5 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +          |   
+      |                                                                                         |   
+      |                                                                                         |   
+  4.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    4 |-+                                                                 A                   +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  3.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    3 |-+                                          A                                          +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  2.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    2 |-+                    A                                                                +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  1.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |          +           +          +          +          +           +          +          |   
+    1 +-----------------------------------------------------------------------------------------+   
+    05:08      05:08       05:09      05:09      05:10      05:10       05:11      05:11      05:12 
+                                                                                                    
diff --git a/t/basic-xticlabels-domain.ref b/t/basic-xticlabels-domain.ref
new file mode 100644
index 0000000..aef60f4
--- /dev/null
+++ b/t/basic-xticlabels-domain.ref
@@ -0,0 +1,39 @@
+  5 +-------------------------------------------------------------------------------------------+   
+    |           +          +                                       *     +     *     +          |   
+    |                                                              *           *                |   
+    |                                                              *           *                |   
+    |                                                              *           *                |   
+    |                                                              *           *                |   
+    |                                                              *           *                |   
+  4 |-+                                                            #############              +-|   
+    |                                                              #           #                |   
+    |                                                              #           #                |   
+    |                                                              #           #                |   
+    |                                                              #           #                |   
+    |                                                              #           #                |   
+    |                                                              #           #                |   
+  3 |-+              *************                                 #           #              +-|   
+    |                *           *                                 #           #                |   
+    |                *           *                                 #           #                |   
+    |                *           *                                 #           #                |   
+    |                *           *                                 #           #                |   
+    |                *           *                                 #           #                |   
+    |                *           *                                 #           #                |   
+    |                *           *                                 #           #                |   
+  2 |-+   ***********#############                                 #           #***********   +-|   
+    |     *          #           #                                 #           #          *     |   
+    |     *          #           #                                 #           #          *     |   
+    |     *          #           #                                 #           #          *     |   
+    |     *          #           #                                 #           #          *     |   
+    |     *          #           #                                 #           #          *     |   
+    |     *          #           #                                 #           #          *     |   
+  1 |-+   ############           #                                 #           ############   +-|   
+    |     #          #           #                                 #           #          #     |   
+    |     #          #           #                                 #           #          #     |   
+    |     #          #           #                                 #           #          #     |   
+    |     #          #           #                                 #           #          #     |   
+    |     #          #           #                                 #           #          #     |   
+    |     #     +    #     +     #                                 #     +     #     +    #     |   
+  0 +-------------------------------------------------------------------------------------------+   
+               aaa        bbb                                           ccc         ddd             
+                                                                                                    
diff --git a/t/basic-xticlabels-no-domain.ref b/t/basic-xticlabels-no-domain.ref
new file mode 100644
index 0000000..86b9048
--- /dev/null
+++ b/t/basic-xticlabels-no-domain.ref
@@ -0,0 +1,39 @@
+  5 +-------------------------------------------------------------------------------------------+   
+    |                 +                  +        *        +        *         +                 |   
+    |                                             *                 *                           |   
+    |                                             *                 *                           |   
+    |                                             *                 *                           |   
+    |                                             *                 *                           |   
+    |                                             *                 *                           |   
+  4 |-+                                           ###################                         +-|   
+    |                                             #                 #                           |   
+    |                                             #                 #                           |   
+    |                                             #                 #                           |   
+    |                                             #                 #                           |   
+    |                                             #                 #                           |   
+    |                                             #                 #                           |   
+  3 |-+                         ******************#                 #                         +-|   
+    |                           *                 #                 #                           |   
+    |                           *                 #                 #                           |   
+    |                           *                 #                 #                           |   
+    |                           *                 #                 #                           |   
+    |                           *                 #                 #                           |   
+    |                           *                 #                 #                           |   
+    |                           *                 #                 #                           |   
+  2 |-+      *******************###################                 #*******************      +-|   
+    |        *                  #                 #                 #                  *        |   
+    |        *                  #                 #                 #                  *        |   
+    |        *                  #                 #                 #                  *        |   
+    |        *                  #                 #                 #                  *        |   
+    |        *                  #                 #                 #                  *        |   
+    |        *                  #                 #                 #                  *        |   
+  1 |-+      ####################                 #                 ####################      +-|   
+    |        #                  #                 #                 #                  #        |   
+    |        #                  #                 #                 #                  #        |   
+    |        #                  #                 #                 #                  #        |   
+    |        #                  #                 #                 #                  #        |   
+    |        #                  #                 #                 #                  #        |   
+    |        #        +         #        +        #        +        #         +        #        |   
+  0 +-------------------------------------------------------------------------------------------+   
+                     aaa                bbb               ccc                ddd                    
+                                                                                                    
diff --git a/t/circles.ref b/t/circles.ref
new file mode 100644
index 0000000..b868c4b
--- /dev/null
+++ b/t/circles.ref
@@ -0,0 +1,39 @@
+    5 +-----------------------------------------------------------------------------------------+   
+      |        +        +        +        +        +        +        +        *        +       *|   
+      |                                                                       *                *|   
+      |                                                                       ***            ***|   
+  4.5 |-+                                                                       ***        ***+-|   
+      |                                                                           **********    |   
+      |                                                          ********                       |   
+      |                                                        ***      ***                     |   
+      |                                                       **          **                    |   
+    4 |-+                                                     *            **                 +-|   
+      |                                                       *            *                    |   
+      |                                                       **          **                    |   
+      |                                                        ***      ***                     |   
+  3.5 |-+                                                        ********                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                         ******                                          |   
+      |                                       **      **                                        |   
+    3 |-+                                     *        **                                     +-|   
+      |                                       *        *                                        |   
+      |                                       **      **                                        |   
+      |                                         ******                                          |   
+  2.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                          *                                                              |   
+      |                      ********                                                           |   
+    2 |-+                    *      **                                                        +-|   
+      |                      *      *                                                           |   
+      |                      ********                                                           |   
+      |                                                                                         |   
+  1.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |        *        +        +        +        +        +        +        +        +        |   
+    1 +-----------------------------------------------------------------------------------------+   
+     0.5       1       1.5       2       2.5       3       3.5       4       4.5       5       5.5  
+                                                                                                    
diff --git a/t/cumulative-histogram.ref b/t/cumulative-histogram.ref
new file mode 100644
index 0000000..2f6aa58
--- /dev/null
+++ b/t/cumulative-histogram.ref
@@ -0,0 +1,39 @@
+  50 +------------------------------------------------------------------------------------------+   
+     |            +            +            +            +            +      ** ***+*           |   
+     |                                                                     **** *** *           |   
+     |                                                                  ** **** *** *           |   
+     |                                                              ** *** **** *** *           |   
+     |                                                           ***** *** **** *** *           |   
+     |                                                        **** *** *** **** *** *           |   
+  40 |-+                                                   ** **** *** *** **** *** *         +-|   
+     |                                                  ***** **** *** *** **** *** *           |   
+     |                                              ***** *** **** *** *** **** *** *           |   
+     |                                             ** *** *** **** *** *** **** *** *           |   
+     |                                            *** *** *** **** *** *** **** *** *           |   
+     |                                        ******* *** *** **** *** *** **** *** *           |   
+     |                                     ***** **** *** *** **** *** *** **** *** *           |   
+  30 |-+                                 *** *** **** *** *** **** *** *** **** *** *         +-|   
+     |                                 ***** *** **** *** *** **** *** *** **** *** *           |   
+     |                                ** *** *** **** *** *** **** *** *** **** *** *           |   
+     |                              **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |                            ****** *** *** **** *** *** **** *** *** **** *** *           |   
+     |                          *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |                        ***** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |                       ** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+  20 |-+                  ***** *** **** *** *** **** *** *** **** *** *** **** *** *         +-|   
+     |                   ** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |                  *** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |                  *** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |                 **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |               ****** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |              ** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+  10 |-+            ** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *         +-|   
+     |             *** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |             *** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |             *** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |           ***** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |           * *** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |   
+     |           *+*** **** ***+*** **** ***+*** **** ***+*** **** ***+*** **** ***+*           |   
+   0 +------------------------------------------------------------------------------------------+   
+   -500           0           500          1000         1500         2000         2500         3000 
+                                                                                                    
diff --git a/t/dataid-plot.ref b/t/dataid-plot.ref
new file mode 100644
index 0000000..6e62a4a
--- /dev/null
+++ b/t/dataid-plot.ref
@@ -0,0 +1,39 @@
+  25 +------------------------------------------------------------------------------------------+   
+     |          +           +          +           +          +          +           +          |   
+     |                                                                                2 ***A*** |   
+     |                                                                                4 ###B### |   
+     |                                                                                6 $$$C$$$ |   
+     |                                                                                8 %%%D%%% |   
+     |                                                                               10 @@@E@@@ |   
+  20 |-+                                                                                      +-|   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                   D                      |   
+  15 |-+                                                                                      +-|   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+  10 |-+                                                                                      +-|   
+     |                                             C                                            |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+   5 |-+                                                                                      +-|   
+     |                      B                                                                   |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |                                                                                          |   
+     |          +           +          +           +          +          +           +          |   
+   0 +------------------------------------------------------------------------------------------+   
+     1         1.5          2         2.5          3         3.5         4          4.5         5   
+                                                                                                    
diff --git a/t/domain-plot.ref b/t/domain-plot.ref
new file mode 100644
index 0000000..664d14f
--- /dev/null
+++ b/t/domain-plot.ref
@@ -0,0 +1,39 @@
+  25 +------------------------------------------------------------------------------------------+   
+     |          +           +          +           +          +          +           +        **|   
+     |                                                                                      **  |   
+     |                                                                                    **    |   
+     |                                                                                   *      |   
+     |                                                                                 **       |   
+     |                                                                               **         |   
+  20 |-+                                                                           **         +-|   
+     |                                                                           **             |   
+     |                                                                          *               |   
+     |                                                                        **                |   
+     |                                                                      **                  |   
+     |                                                                    **                    |   
+     |                                                                  *A                      |   
+  15 |-+                                                              **                      +-|   
+     |                                                              **                          |   
+     |                                                            **                            |   
+     |                                                          **                              |   
+     |                                                       ***                                |   
+     |                                                     **                                   |   
+     |                                                   **                                     |   
+     |                                                 **                                       |   
+  10 |-+                                             **                                       +-|   
+     |                                            *A*                                           |   
+     |                                         ***                                              |   
+     |                                     ****                                                 |   
+     |                                  ***                                                     |   
+     |                               ***                                                        |   
+     |                           ****                                                           |   
+   5 |-+                      ***                                                             +-|   
+     |                    **A*                                                                  |   
+     |                ****                                                                      |   
+     |           *****                                                                          |   
+     |      *****                                                                               |   
+     |  ****                                                                                    |   
+     |**        +           +          +           +          +          +           +          |   
+   0 +------------------------------------------------------------------------------------------+   
+     2          3           4          5           6          7          8           9          10  
+                                                                                                    
diff --git a/t/equations.ref b/t/equations.ref
new file mode 100644
index 0000000..088628d
--- /dev/null
+++ b/t/equations.ref
@@ -0,0 +1,39 @@
+  16 +------------------------------------------------------------------------------------------+   
+     |            +            +            +            +            +            +            |   
+     |                                                                       $$$$$$$$$$$$$$**** |   
+     |                                                                       $      x-1 ##$#### |   
+  14 |-+                                                        $$$$$$$$$$$$$$      x+1 %%%%%%%-|   
+     |                                                          $            $            $     |   
+     |                                                          $            $            $     |   
+     |                                             $$$$$$$$$$$$$$            $            $     |   
+     |                                             $            $            $            $     |   
+  12 |-+                              $$$$$$$$$$$$$$            $            $            $   +-|   
+     |                                $            $            $            $            $     |   
+     |                   $$$$$$$$$$$$$$            $            $            $            $     |   
+     |                   $            $            $            $            $            $     |   
+  10 |-+    $$$$$$$$$$$$$$            $            $            $            $            $   +-|   
+     |      $            $            $            $            $            $            $     |   
+     |      $            $            $            $            $            $            $     |   
+     |      $            $            $            $            $            $            $     |   
+     |      $            $            $            $            $            $            $     |   
+   8 |-+    $            $            $            $            $            $            $  %%%|   
+     |      $            $            $            $            $            $          %%%%%   |   
+     |      $            $            $            $            $            $    %%%%%%  $    *|   
+     |      $            $            $            $            $           %%%%%%        $**** |   
+   6 |-+    $            $            $            $            $     %%%%%% $     *******$   +-|   
+     |      $            $            $            $            $%%%%%       $*****       $#####|   
+     |      $            $            $            $       %%%%%%       *****$       #####$     |   
+     |      $            $            $            $ %%%%%%     $  *****     $ ######     $     |   
+     |      $            $            $        %%%%%%       ****$**      ####$##          $     |   
+   4 |-+    $            $            $   %%%%%    $   *****    $   #####    $            $   +-|   
+     |      $            $         %%%%%%%       **$***       ##$###         $            $     |   
+     |      $            $    %%%%%   $    ******  $    ######  $            $            $     |   
+     |      $           %%%%%%       *$****       #$####        $            $            $     |   
+   2 |-+    $      %%%%% $      ***** $      ##### $            $            $            $   +-|   
+     |      %%%%%%%      $******      $######      $            $            $            $     |   
+     | %%%%%$       *****$       #####$            $            $            $            $     |   
+     |%     $ ******     $ ######     $            $            $            $            $     |   
+     |   ***$*    +   ###$#    +      $     +      $     +      $     +      $     +      $     |   
+   0 +------------------------------------------------------------------------------------------+   
+     0            1            2            3            4            5            6            7   
+                                                                                                    
diff --git a/t/error-bars-using-extravaluesperpoint.ref b/t/error-bars-using-extravaluesperpoint.ref
new file mode 100644
index 0000000..3a099a7
--- /dev/null
+++ b/t/error-bars-using-extravaluesperpoint.ref
@@ -0,0 +1,39 @@
+  5.5 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +          |   
+      |                                                                                         |   
+      |                                                                                         |   
+    5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+  4.5 |-+                                                                                     +*|   
+      |                                                                  ***                    |   
+      |                                                                   *                     |   
+      |                                                                   *                     |   
+    4 |-+                                                                 A                   +-|   
+      |                                                                   *                     |   
+      |                                                                   *                     |   
+  3.5 |-+                                                                ***                  +-|   
+      |                                                                                         |   
+      |                                           ***                                           |   
+      |                                            *                                            |   
+    3 |-+                                          A                                          +-|   
+      |                                            *                                            |   
+      |                                           ***                                           |   
+      |                                                                                         |   
+  2.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                     ***                                                                 |   
+    2 |-+                    A                                                                +-|   
+      |                      *                                                                  |   
+      |                     ***                                                                 |   
+      |                                                                                         |   
+  1.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+    1 |*+                                                                                     +-|   
+      |*                                                                                        |   
+      |                                                                                         |   
+      |          +           +          +          +          +           +          +          |   
+  0.5 +-----------------------------------------------------------------------------------------+   
+      1         1.5          2         2.5         3         3.5          4         4.5         5   
+                                                                                                    
diff --git a/t/error-bars-using-rangesize-rangesizeall.ref b/t/error-bars-using-rangesize-rangesizeall.ref
new file mode 100644
index 0000000..00657cb
--- /dev/null
+++ b/t/error-bars-using-rangesize-rangesizeall.ref
@@ -0,0 +1,39 @@
+    +-------------------------------------------------------------------------------------------+   
+    |           +          +           +          +           +          +           +          |   
+    |                                                                                           |   
+    |                                                                                           |   
+  5 |-+                                                                                       +-|   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                          *|   
+    |                                                                   ***                     |   
+    |                                                                    *                      |   
+    |#                                                                   *                      |   
+  4 |#+                                                                  A                    +-|   
+    |#                                                                   *                      |   
+    |                                                                    *                      |   
+    |                                                                   ***                     |   
+    |                                                                                           |   
+    |                                            ***                                            |   
+    |             #          #                    *                                             |   
+  3 |-+           #########B##                    A                                           +-|   
+    |             #          #                    *                                             |   
+    |                                            ***                                            |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                     ***       #                #                                          |   
+  2 |-+                    A        ##############B###                                        +-|   
+    |                      *        #                #                                          |   
+    |                     ***                                                                   |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                  #                      #                 |   
+  1 |*+                                                ##################B#####               +-|   
+    |*                                                 #                      #                 |   
+    |                                                                                           |   
+    |           +          +           +          +           +          +           +          |   
+    +-------------------------------------------------------------------------------------------+   
+    1          1.5         2          2.5         3          3.5         4          4.5         5   
+                                                                                                    
diff --git a/t/error-bars-using-rangesizeall.ref b/t/error-bars-using-rangesizeall.ref
new file mode 100644
index 0000000..3a099a7
--- /dev/null
+++ b/t/error-bars-using-rangesizeall.ref
@@ -0,0 +1,39 @@
+  5.5 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +          |   
+      |                                                                                         |   
+      |                                                                                         |   
+    5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+  4.5 |-+                                                                                     +*|   
+      |                                                                  ***                    |   
+      |                                                                   *                     |   
+      |                                                                   *                     |   
+    4 |-+                                                                 A                   +-|   
+      |                                                                   *                     |   
+      |                                                                   *                     |   
+  3.5 |-+                                                                ***                  +-|   
+      |                                                                                         |   
+      |                                           ***                                           |   
+      |                                            *                                            |   
+    3 |-+                                          A                                          +-|   
+      |                                            *                                            |   
+      |                                           ***                                           |   
+      |                                                                                         |   
+  2.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                     ***                                                                 |   
+    2 |-+                    A                                                                +-|   
+      |                      *                                                                  |   
+      |                     ***                                                                 |   
+      |                                                                                         |   
+  1.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+    1 |*+                                                                                     +-|   
+      |*                                                                                        |   
+      |                                                                                         |   
+      |          +           +          +          +          +           +          +          |   
+  0.5 +-----------------------------------------------------------------------------------------+   
+      1         1.5          2         2.5         3         3.5          4         4.5         5   
+                                                                                                    
diff --git a/t/error-bars-using-tuplesize-tuplesizeall.ref b/t/error-bars-using-tuplesize-tuplesizeall.ref
new file mode 100644
index 0000000..00657cb
--- /dev/null
+++ b/t/error-bars-using-tuplesize-tuplesizeall.ref
@@ -0,0 +1,39 @@
+    +-------------------------------------------------------------------------------------------+   
+    |           +          +           +          +           +          +           +          |   
+    |                                                                                           |   
+    |                                                                                           |   
+  5 |-+                                                                                       +-|   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                          *|   
+    |                                                                   ***                     |   
+    |                                                                    *                      |   
+    |#                                                                   *                      |   
+  4 |#+                                                                  A                    +-|   
+    |#                                                                   *                      |   
+    |                                                                    *                      |   
+    |                                                                   ***                     |   
+    |                                                                                           |   
+    |                                            ***                                            |   
+    |             #          #                    *                                             |   
+  3 |-+           #########B##                    A                                           +-|   
+    |             #          #                    *                                             |   
+    |                                            ***                                            |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                     ***       #                #                                          |   
+  2 |-+                    A        ##############B###                                        +-|   
+    |                      *        #                #                                          |   
+    |                     ***                                                                   |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                  #                      #                 |   
+  1 |*+                                                ##################B#####               +-|   
+    |*                                                 #                      #                 |   
+    |                                                                                           |   
+    |           +          +           +          +           +          +           +          |   
+    +-------------------------------------------------------------------------------------------+   
+    1          1.5         2          2.5         3          3.5         4          4.5         5   
+                                                                                                    
diff --git a/t/error-bars-using-tuplesize.ref b/t/error-bars-using-tuplesize.ref
new file mode 100644
index 0000000..3a099a7
--- /dev/null
+++ b/t/error-bars-using-tuplesize.ref
@@ -0,0 +1,39 @@
+  5.5 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +          |   
+      |                                                                                         |   
+      |                                                                                         |   
+    5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+  4.5 |-+                                                                                     +*|   
+      |                                                                  ***                    |   
+      |                                                                   *                     |   
+      |                                                                   *                     |   
+    4 |-+                                                                 A                   +-|   
+      |                                                                   *                     |   
+      |                                                                   *                     |   
+  3.5 |-+                                                                ***                  +-|   
+      |                                                                                         |   
+      |                                           ***                                           |   
+      |                                            *                                            |   
+    3 |-+                                          A                                          +-|   
+      |                                            *                                            |   
+      |                                           ***                                           |   
+      |                                                                                         |   
+  2.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                     ***                                                                 |   
+    2 |-+                    A                                                                +-|   
+      |                      *                                                                  |   
+      |                     ***                                                                 |   
+      |                                                                                         |   
+  1.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+    1 |*+                                                                                     +-|   
+      |*                                                                                        |   
+      |                                                                                         |   
+      |          +           +          +          +          +           +          +          |   
+  0.5 +-----------------------------------------------------------------------------------------+   
+      1         1.5          2         2.5         3         3.5          4         4.5         5   
+                                                                                                    
diff --git a/t/histogram-plot.ref b/t/histogram-plot.ref
new file mode 100644
index 0000000..04aa11d
--- /dev/null
+++ b/t/histogram-plot.ref
@@ -0,0 +1,39 @@
+    4 +-----------------------------------------------------------------------------------------+   
+      |           *+**          +            +           +            +            +            |   
+      |           * **                                                                          |   
+      |           * **                                                                          |   
+  3.5 |-+         * **                                                                        +-|   
+      |           * **                                                                          |   
+      |           * **                                                                          |   
+      |           * **                                                                          |   
+      |           * **                                                                          |   
+    3 |-+         * ***                                                                       +-|   
+      |           * ***                                                                         |   
+      |           * ***                                                                         |   
+      |           * ***                                                                         |   
+  2.5 |-+         * ***                                                                       +-|   
+      |           * ***                                                                         |   
+      |           * ***                                                                         |   
+      |           * ***                                                                         |   
+      |           * ***                                                                         |   
+    2 |-+         * **** ***                                                                  +-|   
+      |           * **** ***                                                                    |   
+      |           * **** ***                                                                    |   
+      |           * **** ***                                                                    |   
+  1.5 |-+         * **** ***                                                                  +-|   
+      |           * **** ***                                                                    |   
+      |           * **** ***                                                                    |   
+      |           * **** ***                                                                    |   
+      |           * **** ***                                                                    |   
+    1 |-+         * ************************** ******** ************************** **         +-|   
+      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |   
+      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |   
+      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |   
+  0.5 |-+         * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **         +-|   
+      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |   
+      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |   
+      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |   
+      |           *+**** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |   
+    0 +-----------------------------------------------------------------------------------------+   
+    -500           0           500          1000        1500         2000         2500         3000 
+                                                                                                    
diff --git a/t/lines-on-both-axes-with-labels-legends-titles-different-styles.ref b/t/lines-on-both-axes-with-labels-legends-titles-different-styles.ref
new file mode 100644
index 0000000..745af90
--- /dev/null
+++ b/t/lines-on-both-axes-with-labels-legends-titles-different-styles.ref
@@ -0,0 +1,38 @@
+                                            Test plot                                               
+     10 +-------------------------------------------------------------------------------+ 30        
+        |         +         +         +         +         +         +         +      ** |           
+        |                                                                data 0 ******* |           
+        |                                                                       **      |           
+      9 |-+                                                                  ***        |           
+        |                                                                  **         +-| 25        
+        |                                                               ***             |           
+        |                                                             **                |           
+      8 |-+                                                        ***                  |           
+        |                                                        **                     |           
+        |                                                     ***                       |           
+        |                                                   **                        +-| 20        
+      7 |-+                                              ***                            |           
+        |                                              **                               |           
+        |                                           ***                                 |           
+        |                                         **                G                   |           
+      6 |-+                                    ***                                    +-| 15        
+  y     |                                    **                                         |    y2     
+        |                                  **                                           |           
+        |                                **                                             |           
+        |                             ***                                               |           
+      5 |-+                         **                                                  |           
+        |                         **                                                  +-| 10        
+        |                       **              G                                       |           
+        |                     **                                                        |           
+      4 |-+                ***                                                          |           
+        |                **                                                             |           
+        |             ***                                                             +-| 5         
+        |           **                                                                  |           
+      3 |-+      ***        G                                                           |           
+        |      **                                                                       |           
+        |   ***                                                                         |           
+        | **      +         +         +         +         +         +         +         |           
+      2 +-------------------------------------------------------------------------------+ 0         
+        1        1.5        2        2.5        3        3.5        4        4.5        5           
+                                                x                                                   
+                                                                                                    
diff --git a/t/lines-on-both-axes-with-labels-legends-titles.ref b/t/lines-on-both-axes-with-labels-legends-titles.ref
new file mode 100644
index 0000000..6101dee
--- /dev/null
+++ b/t/lines-on-both-axes-with-labels-legends-titles.ref
@@ -0,0 +1,38 @@
+                                            Test plot                                               
+     10 +-------------------------------------------------------------------------------+ 30        
+        |         +         +         +         +         +         +         +      ** |           
+        |                                                                data 0 ***A*** |           
+        |                                                                       **      |           
+      9 |-+                                                                  ***        |           
+        |                                                                  **         +#| 25        
+        |                                                               ***          ## |           
+        |                                                             **           ##   |           
+      8 |-+                                                        *A*           ##     |           
+        |                                                        **            ##       |           
+        |                                                     ***            ##         |           
+        |                                                   **             ##         +-| 20        
+      7 |-+                                              ***             ##             |           
+        |                                              **              ##               |           
+        |                                           ***              ##                 |           
+        |                                         **               #B                   |           
+      6 |-+                                    *A*               ##                   +-| 15        
+  y     |                                    **               ###                       |    y2     
+        |                                  **               ##                          |           
+        |                                **              ###                            |           
+        |                             ***              ##                               |           
+      5 |-+                         **              ###                                 |           
+        |                         **              ##                                  +-| 10        
+        |                       **             #B#                                      |           
+        |                     **           ####                                         |           
+      4 |-+                *A*          ###                                             |           
+        |                **          ###                                                |           
+        |             ***        ####                                                 +-| 5         
+        |           **        ###                                                       |           
+      3 |-+      ***     ###B#                                                          |           
+        |      ** #######                                                               |           
+        |   ######                                                                      |           
+        |###      +         +         +         +         +         +         +         |           
+      2 +-------------------------------------------------------------------------------+ 0         
+        1        1.5        2        2.5        3        3.5        4        4.5        5           
+                                                x                                                   
+                                                                                                    
diff --git a/t/monotonicity-check.ref b/t/monotonicity-check.ref
new file mode 100644
index 0000000..5e1870e
--- /dev/null
+++ b/t/monotonicity-check.ref
@@ -0,0 +1,39 @@
+   10 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +       ** |   
+      |                                                                                   ***   |   
+      |                                                                                 **      |   
+  9.5 |-+                                                                            ***      +-|   
+      |                                                                            **           |   
+      |                                                                          **             |   
+      |                                                                       ***               |   
+      |                                                                     **                  |   
+    9 |-+                                                                *A*                  +-|   
+      |                                                                **                       |   
+      |                                                             ***                         |   
+      |                                                           **                            |   
+  8.5 |-+                                                      ***                            +-|   
+      |                                                     ***                                 |   
+      |                                                   **                                    |   
+      |                                                ***                                      |   
+      |                                              **                                         |   
+    8 |-+                                         *A*                                         +-|   
+      |                                         **                                              |   
+      |                                      ***                                                |   
+      |                                    **                                                   |   
+  7.5 |-+                               ***                                                   +-|   
+      |                               **                                                        |   
+      |                             **                                                          |   
+      |                          ***                                                            |   
+      |                        **                                                               |   
+    7 |-+                   *A*                                                               +-|   
+      |                   **                                                                    |   
+      |                ***                                                                      |   
+      |              **                                                                         |   
+  6.5 |-+         ***                                                                         +-|   
+      |        ***                                                                              |   
+      |      **                                                                                 |   
+      |   ***                                                                                   |   
+      | **       +           +          +          +          +           +          +          |   
+    6 +-----------------------------------------------------------------------------------------+   
+      0         0.5          1         1.5         2         2.5          3         3.5         4   
+                                                                                                    
diff --git a/t/plots.t b/t/plots.t
index 43ef00f..6b0a169 100644
--- a/t/plots.t
+++ b/t/plots.t
@@ -3,7 +3,7 @@
 # This tests various features of feedgnuplot. Note that the tests look at actual
 # plot output using the 'dumb' terminal, so any changes in gnuplot itself that
 # change the way the output looks will show up as test failures. Currently the
-# reference plots come from gnuplot 4.6.4, and I make sure this is the version
+# reference plots come from gnuplot 5.4, and I make sure this is the version
 # we're testing with
 #
 # Note that some tests are only executed when the RUN_ALL_TESTS environment
@@ -27,303 +27,56 @@ BEGIN {
   my $gnuplotVersion = `gnuplot --version`;
   if( !$gnuplotVersion || $@)
   {
-    print("1..0 # Skip: gnuplot not installed. Tests require ver. 4.6.4; feedgnuplot works with any.\n");
+    print("1..0 # Skip: gnuplot not installed. Tests require ver. 5.4; feedgnuplot works with any.\n");
     exit(0);
   }
 
   chomp $gnuplotVersion;
-  if ($gnuplotVersion ne "gnuplot 4.6 patchlevel 4")
+  if ($gnuplotVersion ne "gnuplot 5.4 patchlevel 1")
   {
-    print("1..0 # Skip: tests require gnuplot 4.6.4. Instead I detected '$gnuplotVersion'.\n");
+    print("1..0 # Skip: tests require gnuplot 5.4. Instead I detected '$gnuplotVersion'.\n");
     exit(0);
   }
 }
 
-use Test::More tests => 58;
+use Test::More tests => 84;
 use File::Temp 'tempfile';
 use IPC::Run 'run';
 use String::ShellQuote;
-use File::Basename;
+use FindBin qw($Bin);
 
 tryplot( testname => 'basic line plot',
          cmd      => 'seq 5',
          options  => [qw(--lines --points)],
-         refplot  => <<'EOF' );
-
-
-    5 ++---------+-----------+----------+----------+----------+-----------+----------+---------*A
-      +          +           +          +          +          +           +          +       ** +
-      |                                                                                   ***   |
-      |                                                                                 **      |
-  4.5 ++                                                                             ***       ++
-      |                                                                            **           |
-      |                                                                          **             |
-      |                                                                       ***               |
-      |                                                                     **                  |
-    4 ++                                                                 *A*                   ++
-      |                                                               ***                       |
-      |                                                            ***                          |
-      |                                                         ***                             |
-  3.5 ++                                                      **                               ++
-      |                                                    ***                                  |
-      |                                                 ***                                     |
-      |                                              ***                                        |
-    3 ++                                          *A*                                          ++
-      |                                         **                                              |
-      |                                      ***                                                |
-      |                                    **                                                   |
-      |                                 ***                                                     |
-  2.5 ++                              **                                                       ++
-      |                             **                                                          |
-      |                          ***                                                            |
-      |                        **                                                               |
-    2 ++                    *A*                                                                ++
-      |                   **                                                                    |
-      |                ***                                                                      |
-      |              **                                                                         |
-      |           ***                                                                           |
-  1.5 ++       ***                                                                             ++
-      |      **                                                                                 |
-      |   ***                                                                                   |
-      + **       +           +          +          +          +           +          +          +
-    1 A*---------+-----------+----------+----------+----------+-----------+----------+---------++
-      1         1.5          2         2.5         3         3.5          4         4.5         5
-
-EOF
+         refplot  => 'basic-line-plot.ref' );
 
 tryplot( testname => 'basic line plot to piped hardcopy',
          cmd      => 'seq 5',
          options  => [qw(--lines --points),
                       '--hardcopy', '|cat'],
-         refplot  => <<'EOF' );
-
-
-    5 ++---------+-----------+----------+----------+----------+-----------+----------+---------*A
-      +          +           +          +          +          +           +          +       ** +
-      |                                                                                   ***   |
-      |                                                                                 **      |
-  4.5 ++                                                                             ***       ++
-      |                                                                            **           |
-      |                                                                          **             |
-      |                                                                       ***               |
-      |                                                                     **                  |
-    4 ++                                                                 *A*                   ++
-      |                                                               ***                       |
-      |                                                            ***                          |
-      |                                                         ***                             |
-  3.5 ++                                                      **                               ++
-      |                                                    ***                                  |
-      |                                                 ***                                     |
-      |                                              ***                                        |
-    3 ++                                          *A*                                          ++
-      |                                         **                                              |
-      |                                      ***                                                |
-      |                                    **                                                   |
-      |                                 ***                                                     |
-  2.5 ++                              **                                                       ++
-      |                             **                                                          |
-      |                          ***                                                            |
-      |                        **                                                               |
-    2 ++                    *A*                                                                ++
-      |                   **                                                                    |
-      |                ***                                                                      |
-      |              **                                                                         |
-      |           ***                                                                           |
-  1.5 ++       ***                                                                             ++
-      |      **                                                                                 |
-      |   ***                                                                                   |
-      + **       +           +          +          +          +           +          +          +
-    1 A*---------+-----------+----------+----------+----------+-----------+----------+---------++
-      1         1.5          2         2.5         3         3.5          4         4.5         5
-
-Wrote output to |cat
-EOF
+         refplot  => 'basic-line-plot-to-piped-hardcopy.ref' );
 
 tryplot( testname => 'basic lines-only plot',
          cmd      => 'seq 5',
          options  => [qw(--lines)],
-         refplot  => <<'EOF' );
-
-
-    5 ++---------+-----------+----------+----------+----------+-----------+----------+---------**
-      +          +           +          +          +          +           +          +       ** +
-      |                                                                                   ***   |
-      |                                                                                 **      |
-  4.5 ++                                                                             ***       ++
-      |                                                                            **           |
-      |                                                                          **             |
-      |                                                                       ***               |
-      |                                                                     **                  |
-    4 ++                                                                 ***                   ++
-      |                                                               ***                       |
-      |                                                            ***                          |
-      |                                                         ***                             |
-  3.5 ++                                                      **                               ++
-      |                                                    ***                                  |
-      |                                                 ***                                     |
-      |                                              ***                                        |
-    3 ++                                          ***                                          ++
-      |                                         **                                              |
-      |                                      ***                                                |
-      |                                    **                                                   |
-      |                                 ***                                                     |
-  2.5 ++                              **                                                       ++
-      |                             **                                                          |
-      |                          ***                                                            |
-      |                        **                                                               |
-    2 ++                    ***                                                                ++
-      |                   **                                                                    |
-      |                ***                                                                      |
-      |              **                                                                         |
-      |           ***                                                                           |
-  1.5 ++       ***                                                                             ++
-      |      **                                                                                 |
-      |   ***                                                                                   |
-      + **       +           +          +          +          +           +          +          +
-    1 **---------+-----------+----------+----------+----------+-----------+----------+---------++
-      1         1.5          2         2.5         3         3.5          4         4.5         5
-
-EOF
+         refplot  => 'basic-lines-only-plot.ref' );
 
 tryplot( testname => 'basic points-only plot',
          cmd      => 'seq 5',
          options  => [qw(--points)],
-         refplot  => <<'EOF' );
-
-
-    5 ++---------+-----------+----------+----------+----------+-----------+----------+---------+A
-      +          +           +          +          +          +           +          +          +
-      |                                                                                         |
-      |                                                                                         |
-  4.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    4 ++                                                                  A                    ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  3.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    3 ++                                           A                                           ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  2.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    2 ++                     A                                                                 ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  1.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      +          +           +          +          +          +           +          +          +
-    1 A+---------+-----------+----------+----------+----------+-----------+----------+---------++
-      1         1.5          2         2.5         3         3.5          4         4.5         5
-
-EOF
+         refplot  => 'basic-points-only-plot.ref' );
 
 tryplot( testname => 'basic line plot with bounds',
          cmd      => 'seq 5',
          options  => [qw(--lines --points),
                       qw(--xmin -10.5 --xmax 4.5 --ymin -0.5 --ymax 5.5)],
-         refplot  => <<'EOF' );
-
-
-    +--+-----------+------------+-----------+-----------+-----------+------------+-----------+--+
-    |  +           +            +           +           +           +            +           +  |
-    |                                                                                           |
-  5 ++                                                                                         ++
-    |                                                                                           |
-    |                                                                                           |
-    |                                                                                           *
-    |                                                                                          *|
-    |                                                                                         * |
-  4 ++                                                                                       A ++
-    |                                                                                       *   |
-    |                                                                                      *    |
-    |                                                                                     *     |
-    |                                                                                    *      |
-    |                                                                                   *       |
-  3 ++                                                                                 A       ++
-    |                                                                                 *         |
-    |                                                                               **          |
-    |                                                                              *            |
-    |                                                                             *             |
-  2 ++                                                                           A             ++
-    |                                                                           *               |
-    |                                                                          *                |
-    |                                                                         *                 |
-    |                                                                        *                  |
-    |                                                                       *                   |
-  1 ++                                                                     A                   ++
-    |                                                                                           |
-    |                                                                                           |
-    |                                                                                           |
-    |                                                                                           |
-    |                                                                                           |
-  0 ++                                                                                         ++
-    |                                                                                           |
-    |  +           +            +           +           +           +            +           +  |
-    +--+-----------+------------+-----------+-----------+-----------+------------+-----------+--+
-      -10         -8           -6          -4          -2           0            2           4
-
-EOF
+         refplot  => 'basic-line-plot-with-bounds.ref' );
 
 tryplot( testname => 'basic line plot with bounds, square aspect ratio',
          cmd      => 'seq 5',
          options  => [qw(--lines --points),
                       qw(--xmin -10.5 --xmax 4.5 --ymin -0.5 --ymax 5.5 --square)],
-         refplot  => <<'EOF' );
-
-
-      +--+-----------+----------+-----------+-----------+-----------+----------+-----------+--+
-      |  +           +          +           +           +           +          +           +  |
-      |                                                                                       |
-    5 ++                                                                                     ++
-      |                                                                                       |
-      |                                                                                       |
-      |                                                                                       *
-      |                                                                                      *|
-      |                                                                                     * |
-    4 ++                                                                                   A ++
-      |                                                                                   *   |
-      |                                                                                  *    |
-      |                                                                                 *     |
-      |                                                                                *      |
-      |                                                                               *       |
-    3 ++                                                                             A       ++
-      |                                                                             *         |
-      |                                                                           **          |
-      |                                                                          *            |
-      |                                                                         *             |
-    2 ++                                                                       A             ++
-      |                                                                       *               |
-      |                                                                      *                |
-      |                                                                     *                 |
-      |                                                                    *                  |
-      |                                                                   *                   |
-    1 ++                                                                 A                   ++
-      |                                                                                       |
-      |                                                                                       |
-      |                                                                                       |
-      |                                                                                       |
-      |                                                                                       |
-    0 ++                                                                                     ++
-      |                                                                                       |
-      |  +           +          +           +           +           +          +           +  |
-      +--+-----------+----------+-----------+-----------+-----------+----------+-----------+--+
-        -10         -8         -6          -4          -2           0          2           4
-
-EOF
+         refplot  => 'basic-line-plot-with-bounds-square-aspect-ratio.ref' );
 
 tryplot( testname => 'lines on both axes with labels, legends, titles',
          cmd      => q{seq 5 | gawk '{print 2*$1, $1*$1}'},
@@ -331,48 +84,7 @@ tryplot( testname => 'lines on both axes with labels, legends, titles',
                       '--legend', '0', 'data 0',
                       '--title', "Test plot",
                       qw(--y2 1 --y2label y2 --xlabel x --ylabel y --y2max 30)],
-         refplot  => <<'EOF' );
-
-                                            Test plot
-                                                                                              y2
-  10 ++---------+----------+---------+----------+----------+----------+---------+---------*A 30
-     +          +          +         +          +          +          +      data 0 **A*** +
-     |                                                                               ***   |
-     |                                                                            ***      |
-   9 ++                                                                         **         |
-     |                                                                       ***          #B 25
-     |                                                                    ***           ## |
-     |                                                                  **            ##   |
-   8 ++                                                              *A*            ##     |
-     |                                                            ***             ##       |
-     |                                                          **              ##         |
-     |                                                       ***              ##          ++ 20
-   7 ++                                                   ***               ##             |
-     |                                                 ***                ##               |
-     |                                               **                 ##                 |
-     |                                            ***                #B#                   |
-   6 ++                                        *A*                ###                     ++ 15
-     |                                       **                 ##                         |
-     |                                     **                ###                           |
-     |                                  ***               ###                              |
-     |                                **               ###                                 |
-   5 ++                             **               ##                                    |
-     |                           ***              ###                                     ++ 10
-     |                         **              #B#                                         |
-     |                       **            ####                                            |
-   4 ++                   *A*           ###                                                |
-     |                 ***          ####                                                   |
-     |               **          ###                                                      ++ 5
-     |            ***        ####                                                          |
-   3 ++        ***      ###B#                                                              |
-     |      *** ########                                                                   |
-     |   #**####                                                                           |
-     B#***      +          +         +          +          +          +         +          +
-   2 A*---------+----------+---------+----------+----------+----------+---------+---------++ 0
-     1         1.5         2        2.5         3         3.5         4        4.5         5
-                                                x
-
-EOF
+         refplot  => 'lines-on-both-axes-with-labels-legends-titles.ref' );
 
 tryplot( testname => 'lines on both axes with labels, legends, titles; different styles',
          cmd      => q{seq 5 | gawk '{print 2*$1, $1*$1}'},
@@ -381,617 +93,200 @@ tryplot( testname => 'lines on both axes with labels, legends, titles; different
                       qw(--y2 1 --y2label y2 --xlabel x --ylabel y --y2max 30),
                       '--curvestyle', '0', 'with lines',
                       '--curvestyle', '1', 'with points ps 3 pt 7'],
-         refplot  => <<'EOF' );
-
-                                            Test plot
-                                                                                              y2
-  10 ++---------+----------+---------+----------+----------+----------+---------+---------** 30
-     +          +          +         +          +          +          +      data 0 ****** +
-     |                                                                               ***   |
-     |                                                                            ***      |
-   9 ++                                                                         **         |
-     |                                                                       ***          +G 25
-     |                                                                    ***              |
-     |                                                                  **                 |
-   8 ++                                                              ***                   |
-     |                                                            ***                      |
-     |                                                          **                         |
-     |                                                       ***                          ++ 20
-   7 ++                                                   ***                              |
-     |                                                 ***                                 |
-     |                                               **                                    |
-     |                                            ***                 G                    |
-   6 ++                                        ***                                        ++ 15
-     |                                       **                                            |
-     |                                     **                                              |
-     |                                  ***                                                |
-     |                                **                                                   |
-   5 ++                             **                                                     |
-     |                           ***                                                      ++ 10
-     |                         **               G                                          |
-     |                       **                                                            |
-   4 ++                   ***                                                              |
-     |                 ***                                                                 |
-     |               **                                                                   ++ 5
-     |            ***                                                                      |
-   3 ++        ***         G                                                               |
-     |      ***                                                                            |
-     |    **                                                                               |
-     G ***      +          +         +          +          +          +         +          +
-   2 **---------+----------+---------+----------+----------+----------+---------+---------++ 0
-     1         1.5         2        2.5         3         3.5         4        4.5         5
-                                                x
-
-EOF
+         refplot  => 'lines-on-both-axes-with-labels-legends-titles-different-styles.ref' );
 
 tryplot( testname => 'domain plot',
          cmd      => q{seq 5 | gawk '{print 2*$1, $1*$1}'},
          options  => [qw(--lines --points), '--domain'],
-         refplot  => <<'EOF' );
-
-
-  25 ++---------+-----------+----------+-----------+----------+----------+-----------+---------+A
-     +          +           +          +           +          +          +           +        **+
-     |                                                                                      **  |
-     |                                                                                    **    |
-     |                                                                                   *      |
-     |                                                                                 **       |
-     |                                                                               **         |
-  20 ++                                                                            **          ++
-     |                                                                           **             |
-     |                                                                          *               |
-     |                                                                        **                |
-     |                                                                      **                  |
-     |                                                                    **                    |
-     |                                                                  *A                      |
-  15 ++                                                               **                       ++
-     |                                                             ***                          |
-     |                                                           **                             |
-     |                                                        ***                               |
-     |                                                      **                                  |
-     |                                                    **                                    |
-     |                                                 ***                                      |
-  10 ++                                              **                                        ++
-     |                                            *A*                                           |
-     |                                         ***                                              |
-     |                                     ****                                                 |
-     |                                  ***                                                     |
-     |                               ***                                                        |
-     |                           ****                                                           |
-   5 ++                       ***                                                              ++
-     |                    **A*                                                                  |
-     |                ****                                                                      |
-     |           *****                                                                          |
-     |      *****                                                                               |
-     |  ****                                                                                    |
-     A**        +           +          +           +          +          +           +          +
-   0 ++---------+-----------+----------+-----------+----------+----------+-----------+---------++
-     2          3           4          5           6          7          8           9          10
-
-EOF
+         refplot  => 'domain-plot.ref' );
 
 tryplot( testname => 'dataid plot',
          cmd      => q{seq 5 | gawk '{print 2*$1, $1*$1}'},
          options  => [qw(--lines --points),
                       qw(--dataid --autolegend)],
-         refplot  => <<'EOF' );
-
-
-  25 ++---------+-----------+----------+-----------+----------+----------+-----------+---------+E
-     +          +           +          +           +          +          +           + 2 **A*** +
-     |                                                                                 4 ##B### |
-     |                                                                                 6 $$C$$$ |
-     |                                                                                 8 %%D%%% |
-     |                                                                                10 @@E@@@ |
-     |                                                                                          |
-  20 ++                                                                                        ++
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                   D                      |
-  15 ++                                                                                        ++
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-  10 ++                                                                                        ++
-     |                                             C                                            |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-   5 ++                                                                                        ++
-     |                      B                                                                   |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     |                                                                                          |
-     A          +           +          +           +          +          +           +          +
-   0 ++---------+-----------+----------+-----------+----------+----------+-----------+---------++
-     1         1.5          2         2.5          3         3.5         4          4.5         5
-
-EOF
+         refplot  => 'dataid-plot.ref' );
 
 tryplot( testname => '3d spiral with bounds, labels',
          cmd      => q{seq 50 | gawk '{print 2*cos($1/5), sin($1/5), $1}'},
          options  => [qw(--lines --points),
                       qw(--3d --domain --zmin -5 --zmax 45 --zlabel z),
                      '--extracmds', 'set view 60,30'],
-         refplot  => <<'EOF' );
-
-
-
-
-
-
-
-                                ***A****A****A****A***A**
-                               *                         **A**
-                                                              **A***A*
-                                                                      *A*
-                                                                         *A
-                                                                           *
-              +                                                             A
-          40  |+               **A****A****A****A***A**                     A
-              |             **A                        **A****A**          A
-          30  |+         A*A                                     *A**    *A
-              |         A                                            *AA*
-       z  20  |+        AA**                                      **A*  *A*
-              |             A**A***A***A****A*****A***A****A****A*         AA
-          10  |+                        -+----                              A
-              |                     ----     +---------                    A
-           0  |+                 ---+             +    ---------
-              |               ---++                          +-+---------
-              |           ----++                                   +     ---------
-              |        ---+                                                    + ----- 1
-              |     ---+                                                      ---  0.8
-              | ----+                                                      --++ 0.6
-              +-+++---------                                           --- 0.20.4
-           -2  -1.5 ++     +---------                               ---  0
-                      -1  +     ++   --+------                   --- -0.2
-                          -0.5     0 +     ++ ---------      ---+ -0.4
-                                       0.5    1  ++   -+--- --0.8.6
-                                                 1.5 +    +-1+
-                                                         2
-
-
-
-
-
-EOF
+         refplot  => '3d-spiral-with-bounds-labels.ref' );
 
 tryplot( testname => '3d spiral with bounds, labels, square xy aspect ratio',
          cmd      => q{seq 50 | gawk '{print 2*cos($1/5), sin($1/5), $1}'},
          options  => [qw(--lines --points),
                       qw(--3d --domain --zmin -5 --zmax 45 --zlabel z),
                      '--extracmds', 'set view 60,30', '--square_xy'],
-         refplot  => <<'EOF' );
-
-
-
-
-
-
-
-
-                                           *AA*
-                                               AA*A
-                                                   A
-                                        +           A*A
-                                    40  |+             A
-                                        |               A
-                                    30  |+               A
-                                        | AAAAA*          A
-                                 z  20  |+AA    AA        A
-                                        |  AA*    A*A    AA
-                                        |     AA*AAA*AA*A
-                                    10  |+             AAA
-                                     0  |+                A
-                                        |                 A
-                                        |    +-           A
-                                        |   -++---
-                                        | --+    +---
-                                        |-++        +---
-                                        +++--           ---
-                                       -21.5+---          +- 1
-                                           -10.5---      + 0.6
-                                                0 +---  +  024
-                                                 0.5  ++-0.4
-                                                    1.521.8
-
-
-
-
-
-
-
-
-EOF
+         refplot  => '3d-spiral-with-bounds-labels-square-xy-aspect-ratio.ref' );
 
 tryplot( testname => 'Monotonicity check',
          cmd      => q{seq 10 | gawk '{print (NR-1)%5,NR}'},
          options  => [qw(--lines --points --domain --monotonic)],
-         refplot  => <<'EOF' );
-
-
-   10 ++---------+-----------+----------+----------+----------+-----------+----------+---------*A
-      +          +           +          +          +          +           +          +       ** +
-      |                                                                                   ***   |
-      |                                                                                 **      |
-  9.5 ++                                                                             ***       ++
-      |                                                                            **           |
-      |                                                                          **             |
-      |                                                                       ***               |
-      |                                                                     **                  |
-    9 ++                                                                 *A*                   ++
-      |                                                               ***                       |
-      |                                                            ***                          |
-      |                                                         ***                             |
-  8.5 ++                                                      **                               ++
-      |                                                    ***                                  |
-      |                                                 ***                                     |
-      |                                              ***                                        |
-    8 ++                                          *A*                                          ++
-      |                                         **                                              |
-      |                                      ***                                                |
-      |                                    **                                                   |
-      |                                 ***                                                     |
-  7.5 ++                              **                                                       ++
-      |                             **                                                          |
-      |                          ***                                                            |
-      |                        **                                                               |
-    7 ++                    *A*                                                                ++
-      |                   **                                                                    |
-      |                ***                                                                      |
-      |              **                                                                         |
-      |           ***                                                                           |
-  6.5 ++       ***                                                                             ++
-      |      **                                                                                 |
-      |   ***                                                                                   |
-      + **       +           +          +          +          +           +          +          +
-    6 A*---------+-----------+----------+----------+----------+-----------+----------+---------++
-      0         0.5          1         1.5         2         2.5          3         3.5         4
-
-EOF
+         refplot  => 'monotonicity-check.ref' );
 
 
 tryplot( testname => 'basic --timefmt plot',
          cmd      => q{seq 5 | gawk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1}'},
          options  => ['--domain', '--timefmt', '%d %b %Y %H:%M:%S'],
-         refplot  => <<'EOF' );
-
-
-    5 ++---------+-----------+----------+----------+----------+-----------+----------+---------+A
-      +          +           +          +          +          +           +          +          +
-      |                                                                                         |
-      |                                                                                         |
-  4.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    4 ++                                                                  A                    ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  3.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    3 ++                                           A                                           ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  2.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    2 ++                     A                                                                 ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  1.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      +          +           +          +          +          +           +          +          +
-    1 A+---------+-----------+----------+----------+----------+-----------+----------+---------++
-    05:08      05:08       05:09      05:09      05:10      05:10       05:11      05:11      05:12
-
-EOF
+         refplot  => 'basic-timefmt-plot.ref' );
 
 tryplot( testname => '--timefmt plot with bounds',
          cmd      => q{seq 5 | gawk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1}'},
          options  => ['--domain', '--timefmt', '%d %b %Y %H:%M:%S',
                       '--xmin', '20 Oct 2013 06:05:00',
                       '--xmax', '20 Oct 2013 06:05:20'],
-         refplot  => <<'EOF' );
-
-
-    5 ++---+---+----+---+----+---+----+---+----+---+----+---A----+---+----+---+----+---+----+--++
-      +                      +                     +                      +                     +
-      |                                                                                         |
-      |                                                                                         |
-  4.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    4 ++                                                A                                      ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  3.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    3 ++                                           A                                           ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  2.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    2 ++                                       A                                               ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  1.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      +                      +                     +                      +                     +
-    1 ++---+---+----+---+----+---+----+---A----+---+----+---+----+---+----+---+----+---+----+--++
-    05:00                  05:05                 05:10                  05:15                 05:20
-
-EOF
+         refplot  => 'timefmt-plot-with-bounds.ref' );
 
 tryplot( testname => '--timefmt plot with --monotonic',
          cmd      => q{seq 10 | gawk '{x=(NR-1)%5; print strftime("%d %b %Y %T",1382249107+x,1),$1}'},
          options  => ['--domain', '--timefmt', '%d %b %Y %H:%M:%S',
                       '--monotonic'],
-         refplot  => <<'EOF' );
-
-
-   10 ++---------+-----------+----------+----------+----------+-----------+----------+---------+A
-      +          +           +          +          +          +           +          +          +
-      |                                                                                         |
-      |                                                                                         |
-  9.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    9 ++                                                                  A                    ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  8.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    8 ++                                           A                                           ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  7.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-    7 ++                     A                                                                 ++
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-      |                                                                                         |
-  6.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-      +          +           +          +          +          +           +          +          +
-    6 A+---------+-----------+----------+----------+----------+-----------+----------+---------++
-    05:07      05:07       05:08      05:08      05:09      05:09       05:10      05:10      05:11
-
-EOF
+         refplot  => 'timefmt-plot-with-monotonic.ref' );
 
 tryplot( testname => '--timefmt with custom rangesize',
          cmd      => q{seq 5 | gawk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1,$1/10}'},
          options  => ['--domain', '--timefmt', '%d %b %Y %H:%M:%S',
                       qw(--with errorbars --rangesizeall 2)],
-         refplot  => <<'EOF' );
-
-
-  5.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------**
-      +          +           +          +          +          +           +          +          *
-      |                                                                                         *
-    5 ++                                                                                       +A
-      |                                                                                         *
-      |                                                                                         *
-      |                                                                                         *
-  4.5 ++                                                                                       **
-      |                                                                  ***                    |
-      |                                                                   *                     |
-    4 ++                                                                  A                    ++
-      |                                                                   *                     |
-      |                                                                   *                     |
-      |                                                                  ***                    |
-  3.5 ++                                                                                       ++
-      |                                           ***                                           |
-      |                                            *                                            |
-    3 ++                                           A                                           ++
-      |                                            *                                            |
-      |                                            *                                            |
-      |                                           ***                                           |
-  2.5 ++                                                                                       ++
-      |                                                                                         |
-      |                     ***                                                                 |
-    2 ++                     A                                                                 ++
-      |                      *                                                                  |
-      |                     ***                                                                 |
-      |                                                                                         |
-  1.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-    1 A*                                                                                       ++
-      **                                                                                        |
-      |                                                                                         |
-      +          +           +          +          +          +           +          +          +
-  0.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------++
-    05:08      05:08       05:09      05:09      05:10      05:10       05:11      05:11      05:12
-
-EOF
+         refplot  => 'timefmt-with-custom-rangesize.ref' );
 
 tryplot( testname => 'Error bars (using extraValuesPerPoint)',
          cmd      => q{seq 5 | gawk '{print $1,$1,$1/10}'},
          options  => [qw(--domain),
                       qw(--extraValuesPerPoint 1 --with errorbars)],
-         refplot  => <<'EOF' );
-
-
-  5.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------**
-      +          +           +          +          +          +           +          +          *
-      |                                                                                         *
-    5 ++                                                                                       +A
-      |                                                                                         *
-      |                                                                                         *
-      |                                                                                         *
-  4.5 ++                                                                                       **
-      |                                                                  ***                    |
-      |                                                                   *                     |
-    4 ++                                                                  A                    ++
-      |                                                                   *                     |
-      |                                                                   *                     |
-      |                                                                  ***                    |
-  3.5 ++                                                                                       ++
-      |                                           ***                                           |
-      |                                            *                                            |
-    3 ++                                           A                                           ++
-      |                                            *                                            |
-      |                                            *                                            |
-      |                                           ***                                           |
-  2.5 ++                                                                                       ++
-      |                                                                                         |
-      |                     ***                                                                 |
-    2 ++                     A                                                                 ++
-      |                      *                                                                  |
-      |                     ***                                                                 |
-      |                                                                                         |
-  1.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-    1 A*                                                                                       ++
-      **                                                                                        |
-      |                                                                                         |
-      +          +           +          +          +          +           +          +          +
-  0.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------++
-      1         1.5          2         2.5         3         3.5          4         4.5         5
-
-EOF
+         refplot  => 'error-bars-using-extravaluesperpoint.ref' );
 
 
 tryplot( testname => 'Error bars (using rangesizeall)',
          cmd      => q{seq 5 | gawk '{print $1,$1,$1/10}'},
          options  => [qw(--domain),
                       qw(--rangesizeall 2 --with errorbars)],
-         refplot  => <<'EOF' );
-
-
-  5.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------**
-      +          +           +          +          +          +           +          +          *
-      |                                                                                         *
-    5 ++                                                                                       +A
-      |                                                                                         *
-      |                                                                                         *
-      |                                                                                         *
-  4.5 ++                                                                                       **
-      |                                                                  ***                    |
-      |                                                                   *                     |
-    4 ++                                                                  A                    ++
-      |                                                                   *                     |
-      |                                                                   *                     |
-      |                                                                  ***                    |
-  3.5 ++                                                                                       ++
-      |                                           ***                                           |
-      |                                            *                                            |
-    3 ++                                           A                                           ++
-      |                                            *                                            |
-      |                                            *                                            |
-      |                                           ***                                           |
-  2.5 ++                                                                                       ++
-      |                                                                                         |
-      |                     ***                                                                 |
-    2 ++                     A                                                                 ++
-      |                      *                                                                  |
-      |                     ***                                                                 |
-      |                                                                                         |
-  1.5 ++                                                                                       ++
-      |                                                                                         |
-      |                                                                                         |
-    1 A*                                                                                       ++
-      **                                                                                        |
-      |                                                                                         |
-      +          +           +          +          +          +           +          +          +
-  0.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------++
-      1         1.5          2         2.5         3         3.5          4         4.5         5
-
-EOF
+         refplot  => 'error-bars-using-rangesizeall.ref' );
 
+tryplot( testname => 'Error bars (using tuplesize)',
+         cmd      => q{seq 5 | gawk '{print $1,$1,$1/10}'},
+         options  => [qw(--domain),
+                      qw(--tuplesizeall 3 --with errorbars)],
+         refplot  => 'error-bars-using-tuplesize.ref' );
 
 tryplot( testname => 'Error bars (using rangesize, rangesizeall)',
          cmd      => q{seq 5 | gawk '{print $1,"vert",$1,$1/10,"horiz",5-$1,$1-$1/5,$1+$1/20}'},
          options  => [qw(--domain --dataid),
                       qw(--rangesize vert 2 --rangesizeall 3 --with xerrorbars --style vert), 'with errorbars',
                       qw(--xmin 1 --xmax 5 --ymin 0.5 --ymax 5.5)],
-         refplot  => <<'EOF' );
-
+         refplot  => 'error-bars-using-rangesize-rangesizeall.ref' );
 
-    +-----------+----------+-----------+----------+-----------+----------+-----------+---------**
-    +           +          +           +          +           +          +           +          *
-    |                                                                                           *
-  5 ++                                                                                         +A
-    |                                                                                           *
-    |                                                                                           *
-    |                                                                                           *
-    |                                                                                          **
-    |                                                                   ***                     |
-    ##                                                                   *                      |
-  4 B#                                                                   A                     ++
-    ##                                                                   *                      |
-    |                                                                    *                      |
-    |                                                                   ***                     |
-    |                                                                                           |
-    |                                            ***                                            |
-    |             #          #                    *                                             |
-  3 ++            #########B##                    A                                            ++
-    |             #          #                    *                                             |
-    |                                             *                                             |
-    |                                            ***                                            |
-    |                                                                                           |
-    |                                                                                           |
-    |                     ***       #                #                                          |
-  2 ++                     A        ##############B###                                         ++
-    |                      *        #                #                                          |
-    |                     ***                                                                   |
-    |                                                                                           |
-    |                                                                                           |
-    |                                                                                           |
-    |                                                  #                      #                 |
-  1 A*                                                 ##################B#####                ++
-    **                                                 #                      #                 |
-    |                                                                                           |
-    +           +          +           +          +           +          +           +          +
-    +-----------+----------+-----------+----------+-----------+----------+-----------+----------+
-    1          1.5         2          2.5         3          3.5         4          4.5         5
+tryplot( testname => 'Error bars (using tuplesize, tuplesizeall)',
+         cmd      => q{seq 5 | gawk '{print $1,"vert",$1,$1/10,"horiz",5-$1,$1-$1/5,$1+$1/20}'},
+         options  => [qw(--domain --dataid),
+                      qw(--tuplesize vert 3 --tuplesizeall 4 --with xerrorbars --style vert), 'with errorbars',
+                      qw(--xmin 1 --xmax 5 --ymin 0.5 --ymax 5.5)],
+         refplot  => 'error-bars-using-tuplesize-tuplesizeall.ref' );
 
+tryplot( testname => 'timefmt without vnl',
+         cmd      => q{echo -n '# t a b\n1:00 5 6\n1:30 10 6\n2:00 7 6\n2:30 10 9\n'},
+         options  => [qw(--lines --points --domain --timefmt), '%H:%M',
+                      '--set', 'format x "%H:%M"'],
+         refplot  => 'timefmt-without-vnl.ref' );
+
+tryplot( testname => 'timefmt without vnl with style 0 default 1',
+         cmd      => q{echo -n '# t a b\n1:00 5 6\n1:30 10 6\n2:00 7 6\n2:30 10 9\n'},
+         options  => [qw(--domain --timefmt), '%H:%M',
+                      '--set', 'format x "%H:%M"',
+                      '--style', '0', 'with lines lt 7'],
+         refplot  => 'timefmt-without-vnl-with-style0-default1.ref' );
+
+tryplot( testname => 'timefmt without vnl with style',
+         cmd      => q{echo -n '# t a b\n1:00 5 6\n1:30 10 6\n2:00 7 6\n2:30 10 9\n'},
+         options  => [qw(--domain --timefmt), '%H:%M',
+                      '--set', 'format x "%H:%M"',
+                      '--style', '0', 'with lines lt 7',
+                      '--style', '1', 'with lines lt 5' ],
+         refplot  => 'timefmt-without-vnl-with-style.ref' );
+
+tryplot( testname => 'timefmt with vnl with style 0 default 1',
+         cmd      => q{echo -n '# t a b\n1:00 5 6\n1:30 10 6\n2:00 7 6\n2:30 10 9\n'},
+         options  => [qw(--domain --timefmt), '%H:%M',
+                      '--set', 'format x "%H:%M"',
+                      '--vnl',
+                      '--style', 'a', 'with lines lt 7'],
+         refplot  => 'timefmt-with-vnl-with-style0-default1.ref' );
+
+tryplot( testname => 'timefmt with vnl with style',
+         cmd      => q{echo -n '# t a b\n1:00 5 6\n1:30 10 6\n2:00 7 6\n2:30 10 9\n'},
+         options  => [qw(--domain --timefmt), '%H:%M',
+                      '--set', 'format x "%H:%M"',
+                      '--vnl',
+                      '--style', 'a', 'with lines lt 7',
+                      '--style', 'b', 'with lines lt 5' ],
+         refplot  => 'timefmt-with-vnl-with-style.ref' );
+
+my $data_xticlabels = <<EOF;
+# x label a b
+ 5  aaa   2 1
+ 6  bbb   3 2
+10  ccc   5 4
+11  ddd   2 1
 EOF
 
+tryplot( testname => 'basic xticlabels no domain',
+         cmd      => qq{echo "$data_xticlabels" | vnl-filter -p label,a,b},
+         options  => ['--vnl',
+                      '--xticlabels',
+                      '--with', 'boxes fill solid border lt -1',
+                      '--ymin', '0'],
+         refplot  => 'basic-xticlabels-no-domain.ref' );
+
+tryplot( testname => 'basic xticlabels domain',
+         cmd      => qq{echo "$data_xticlabels"},
+         options  => [qw(--vnl --domain),
+                      '--xticlabels',
+                      '--with', 'boxes fill solid border lt -1',
+                      '--ymin', '0'],
+         refplot  => 'basic-xticlabels-domain.ref' );
+
+tryplot( testname => 'xticlabels clustered',
+         cmd      => qq{echo "$data_xticlabels" | vnl-filter -p label,a,b},
+         options  => [qw(--vnl),
+                      '--xticlabels',
+                      '--set', 'style data histogram',
+                      '--set', 'style histogram cluster gap 2',
+                      '--set', 'style fill solid border lt -1',
+                      '--ymin', '0'],
+         refplot  => 'xticlabels-clustered.ref' );
+
+tryplot( testname => 'xticlabels styles',
+         cmd      => qq{echo "$data_xticlabels"},
+         options  => [qw(--vnl --domain),
+                      '--xticlabels',
+                      '--style', 'a', 'with points',
+                      '--style', 'b', 'with lines',
+                      '--xmin', '4.5',
+                      '--xmax', '11.5',
+                      '--ymin', '0',
+                      '--ymax', '6'],
+         refplot  => 'xticlabels-styles.ref' );
+
+tryplot( testname => 'xticlabels styles with tuplesize',
+         cmd      => qq{echo "$data_xticlabels"},
+         options  => [qw(--vnl --domain),
+                      '--xticlabels',
+                      '--tuplesizeall', '3',
+                      '--with', 'linespoints pt variable',
+                      '--xmin', '4.5',
+                      '--xmax', '11.5',
+                      '--ymin', '0',
+                      '--ymax', '6'],
+         refplot  => 'xticlabels-styles-with-tuplesize.ref' );
+
+tryplot( testname => 'equations',
+         cmd      => qq{seq 10 15},
+         options  => [qw(--equation x),
+                      qw(--equation-above x+1),
+                      qw(--equation-below x-1),
+                      '--with', 'boxes fill solid border lt -1',
+                      '--ymin', '0'],
+         refplot  => 'equations.ref' );
 
 SKIP:
 {
@@ -1013,141 +308,18 @@ tryplot( testname => 'Histogram plot',
          cmd      => q{seq 50 | gawk '{print $1*$1}'},
          options  => [qw(--lines --points),
                       qw(--histo 0 --binwidth 50 --ymin 0 --curvestyleall), 'with boxes'],
-         refplot  => <<'EOF' );
-
-
-    4 ++----------****----------+------------+-----------+------------+------------+-----------++
-      +           *+**          +            +           +            +            +            +
-      |           * **                                                                          |
-      |           * **                                                                          |
-  3.5 ++          * **                                                                         ++
-      |           * **                                                                          |
-      |           * **                                                                          |
-      |           * **                                                                          |
-      |           * **                                                                          |
-    3 ++          * ***                                                                        ++
-      |           * ***                                                                         |
-      |           * ***                                                                         |
-      |           * ***                                                                         |
-  2.5 ++          * ***                                                                        ++
-      |           * ***                                                                         |
-      |           * ***                                                                         |
-      |           * ***                                                                         |
-    2 ++          * **** ***                                                                   ++
-      |           * **** ***                                                                    |
-      |           * **** ***                                                                    |
-      |           * **** ***                                                                    |
-      |           * **** ***                                                                    |
-  1.5 ++          * **** ***                                                                   ++
-      |           * **** ***                                                                    |
-      |           * **** ***                                                                    |
-      |           * **** ***                                                                    |
-    1 ++          * ************************** ******** ************************** **          ++
-      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |
-      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |
-      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |
-      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |
-  0.5 ++          * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **          ++
-      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |
-      |           * **** *** **** *** **** *** **** *** **** *** **** *** **** *** **           |
-      +           *+**** *** **** *** **** *** **** *** **** *** **** *** **** *** **           +
-    0 ++----------****************************-********-**************************-**----------++
-    -500           0           500          1000        1500         2000         2500         3000
-
-EOF
+         refplot  => 'histogram-plot.ref' );
 
 tryplot( testname => 'Cumulative histogram',
          cmd      => q{seq 50 | gawk '{print $1*$1}'},
          options  => [qw(--lines --points),
                       qw(--histo 0 --histstyle cum --binwidth 50 --ymin 0 --curvestyleall), 'with boxes'],
-         refplot  => <<'EOF' );
-
-
-  50 ++-----------+------------+------------+------------+------------+-----------***----------++
-     +            +            +            +            +            +      ** ***+*           +
-     |                                                                     **** *** *           |
-     |                                                                 *** **** *** *           |
-     |                                                              ** *** **** *** *           |
-     |                                                           ***** *** **** *** *           |
-     |                                                        **** *** *** **** *** *           |
-  40 ++                                                    ** **** *** *** **** *** *          ++
-     |                                                 ****** **** *** *** **** *** *           |
-     |                                              ***** *** **** *** *** **** *** *           |
-     |                                            *** *** *** **** *** *** **** *** *           |
-     |                                         ****** *** *** **** *** *** **** *** *           |
-     |                                        ** **** *** *** **** *** *** **** *** *           |
-     |                                    ****** **** *** *** **** *** *** **** *** *           |
-  30 ++                                  *** *** **** *** *** **** *** *** **** *** *          ++
-     |                                ****** *** **** *** *** **** *** *** **** *** *           |
-     |                               *** *** *** **** *** *** **** *** *** **** *** *           |
-     |                            ****** *** *** **** *** *** **** *** *** **** *** *           |
-     |                           ** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |                          *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |                       ****** **** *** *** **** *** *** **** *** *** **** *** *           |
-  20 ++                     *** *** **** *** *** **** *** *** **** *** *** **** *** *          ++
-     |                   ****** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |                   ** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |                  *** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |                 **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |               ****** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |              ** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-  10 ++             ** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *          ++
-     |             *** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |             *** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |             *** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |           ***** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     |           * *** **** *** *** **** *** *** **** *** *** **** *** *** **** *** *           |
-     +           *+*** **** ***+*** **** ***+*** **** ***+*** **** ***+*** **** ***+*           +
-   0 ++----------********************************************-********+***-****-*****----------++
-   -500           0           500          1000         1500         2000         2500         3000
-
-EOF
+         refplot  => 'cumulative-histogram.ref' );
 
 tryplot( testname => 'Circles',
          cmd      => q{seq 5 | gawk '{print $1,$1,$1/10}'},
          options  => [qw(--circles --domain)],
-         refplot  => <<'EOF' );
-
-
-    5 ++-------+--------+--------+--------+--------+--------+--------+--------*******************
-      +        +        +        +        +        +        +        +        *        +       *+
-      |                                                              *        *                *|
-      |                                                          ********     *                *|
-  4.5 ++                                                        **      **    *                *+
-      |                                                        **        **   **              **|
-      |                                                       **          **   **            ** |
-      |                                                       *            *    **          **  |
-      |                                                       *            *     **        **   |
-    4 ++                                                      *            **     **********   ++
-      |                                                       *            *                    |
-      |                                                       *            *                    |
-      |                                            *          *            *                    |
-  3.5 ++                                        ******        **          **                   ++
-      |                                        *      *        **        **                     |
-      |                                       *        *        **      **                      |
-      |                                       *        *         ********                       |
-    3 ++                                      *        **                                      ++
-      |                                       *        *                                        |
-      |                                       *        *                                        |
-      |                                       *        *                                        |
-      |                                        *      *                                         |
-  2.5 ++                         *              ******                                         ++
-      |                       ******                                                            |
-      |                      **    **                                                           |
-      |                      *      *                                                           |
-    2 ++                     *      **                                                         ++
-      |                      *      **                                                          |
-      |                      *      *                                                           |
-      |                      **    **                                                           |
-      |                       ******                                                            |
-  1.5 ++                                                                                       ++
-      |                                                                                         |
-      |        *                                                                                |
-      +      ****       +        +        +        +        +        +        +        +        +
-    1 ++-----*-+**------+--------+--------+--------+--------+--------+--------+--------+-------++
-     0.5       1       1.5       2       2.5       3       3.5       4       4.5       5       5.5
-
-EOF
+         refplot  => 'circles.ref' );
 
 
 
@@ -1160,1163 +332,37 @@ note( "Starting to run streaming tests. These will take several seconds each" );
 tryplot( testname => 'basic streaming test',
          cmd      => q{seq 500 | gawk 'BEGIN{ print 0; } {print (NR==3)? "exit" : $0; fflush(); system("sleep 1.2");}'},
          options  => [qw(--lines --points --stream)],
-         refplot  => <<'EOF' );
-
-
-    1 ++----------------+-----------------+-----------------+-----------------+----------------*A
-      +                 +                 +                 +                 +              ** +
-      |                                                                                   ***   |
-      |                                                                                ***      |
-      |                                                                              **         |
-      |                                                                           ***           |
-      |                                                                         **              |
-  0.8 ++                                                                     ***               ++
-      |                                                                    **                   |
-      |                                                                 ***                     |
-      |                                                              ***                        |
-      |                                                            **                           |
-      |                                                         ***                             |
-      |                                                       **                                |
-  0.6 ++                                                   ***                                 ++
-      |                                                  **                                     |
-      |                                               ***                                       |
-      |                                            ***                                          |
-      |                                          **                                             |
-      |                                       ***                                               |
-      |                                     **                                                  |
-  0.4 ++                                 ***                                                   ++
-      |                                **                                                       |
-      |                             ***                                                         |
-      |                          ***                                                            |
-      |                        **                                                               |
-      |                     ***                                                                 |
-      |                   **                                                                    |
-  0.2 ++               ***                                                                     ++
-      |              **                                                                         |
-      |           ***                                                                           |
-      |        ***                                                                              |
-      |      **                                                                                 |
-      |   ***                                                                                   |
-      + **              +                 +                 +                 +                 +
-    0 A*----------------+-----------------+-----------------+-----------------+----------------++
-      1                1.2               1.4               1.6               1.8                2
-
-
-
-    2 ++---------------------+---------------------+----------------------+--------------------*A
-      +                      +                     +                      +                  ** +
-      |                                                                                   ***   |
-      |                                                                                ***      |
-      |                                                                              **         |
-      |                                                                           ***           |
-      |                                                                        ***              |
-      |                                                                      **                 |
-      |                                                                   ***                   |
-  1.5 ++                                                               ***                     ++
-      |                                                              **                         |
-      |                                                           ***                           |
-      |                                                        ***                              |
-      |                                                      **                                 |
-      |                                                   ***                                   |
-      |                                                ***                                      |
-      |                                              **                                         |
-    1 ++                                          *A*                                          ++
-      |                                         **                                              |
-      |                                      ***                                                |
-      |                                    **                                                   |
-      |                                 ***                                                     |
-      |                               **                                                        |
-      |                            ***                                                          |
-      |                          **                                                             |
-      |                       ***                                                               |
-  0.5 ++                    **                                                                 ++
-      |                  ***                                                                    |
-      |                **                                                                       |
-      |             ***                                                                         |
-      |           **                                                                            |
-      |        ***                                                                              |
-      |      **                                                                                 |
-      |   ***                                                                                   |
-      + **                   +                     +                      +                     +
-    0 A*---------------------+---------------------+----------------------+--------------------++
-      1                     1.5                    2                     2.5                    3
-
-EOF
+         refplot  => 'basic-streaming-test.ref' );
 
 tryplot( testname => 'basic streaming test, twice as fast',
          cmd      => q{seq 500 | gawk 'BEGIN{ print 0; } {print (NR==3)? "exit" : $0; fflush(); system("sleep 0.6");}'},
          options  => [qw(--lines --points --stream 0.4)],
-         refplot  => <<'EOF' );
-
-
-    1 ++----------------+-----------------+-----------------+-----------------+----------------*A
-      +                 +                 +                 +                 +              ** +
-      |                                                                                   ***   |
-      |                                                                                ***      |
-      |                                                                              **         |
-      |                                                                           ***           |
-      |                                                                         **              |
-  0.8 ++                                                                     ***               ++
-      |                                                                    **                   |
-      |                                                                 ***                     |
-      |                                                              ***                        |
-      |                                                            **                           |
-      |                                                         ***                             |
-      |                                                       **                                |
-  0.6 ++                                                   ***                                 ++
-      |                                                  **                                     |
-      |                                               ***                                       |
-      |                                            ***                                          |
-      |                                          **                                             |
-      |                                       ***                                               |
-      |                                     **                                                  |
-  0.4 ++                                 ***                                                   ++
-      |                                **                                                       |
-      |                             ***                                                         |
-      |                          ***                                                            |
-      |                        **                                                               |
-      |                     ***                                                                 |
-      |                   **                                                                    |
-  0.2 ++               ***                                                                     ++
-      |              **                                                                         |
-      |           ***                                                                           |
-      |        ***                                                                              |
-      |      **                                                                                 |
-      |   ***                                                                                   |
-      + **              +                 +                 +                 +                 +
-    0 A*----------------+-----------------+-----------------+-----------------+----------------++
-      1                1.2               1.4               1.6               1.8                2
-
-
-
-    2 ++---------------------+---------------------+----------------------+--------------------*A
-      +                      +                     +                      +                  ** +
-      |                                                                                   ***   |
-      |                                                                                ***      |
-      |                                                                              **         |
-      |                                                                           ***           |
-      |                                                                        ***              |
-      |                                                                      **                 |
-      |                                                                   ***                   |
-  1.5 ++                                                               ***                     ++
-      |                                                              **                         |
-      |                                                           ***                           |
-      |                                                        ***                              |
-      |                                                      **                                 |
-      |                                                   ***                                   |
-      |                                                ***                                      |
-      |                                              **                                         |
-    1 ++                                          *A*                                          ++
-      |                                         **                                              |
-      |                                      ***                                                |
-      |                                    **                                                   |
-      |                                 ***                                                     |
-      |                               **                                                        |
-      |                            ***                                                          |
-      |                          **                                                             |
-      |                       ***                                                               |
-  0.5 ++                    **                                                                 ++
-      |                  ***                                                                    |
-      |                **                                                                       |
-      |             ***                                                                         |
-      |           **                                                                            |
-      |        ***                                                                              |
-      |      **                                                                                 |
-      |   ***                                                                                   |
-      + **                   +                     +                      +                     +
-    0 A*---------------------+---------------------+----------------------+--------------------++
-      1                     1.5                    2                     2.5                    3
-
-EOF
+         refplot  => 'basic-streaming-test-twice-as-fast.ref' );
 
 
 tryplot( testname => 'streaming with --xlen',
          cmd      => q{seq 500 | gawk 'BEGIN{ print 0; } {print (NR==3)? "exit" : $0; fflush(); system("sleep 0.6");}'},
          options  => [qw(--lines --points --stream 0.4 --xlen 1.1)],
-         refplot  => <<'EOF' );
-
-
-    1 ++------+----------------+---------------+---------------+----------------+--------------*A
-      |       +                +               +               +                +            ** +
-      |                                                                                    **   |
-      |                                                                                 ***     |
-      |                                                                               **        |
-      |                                                                             **          |
-      |                                                                          ***            |
-  0.8 ++                                                                       **              ++
-      |                                                                      **                 |
-      |                                                                   ***                   |
-      |                                                                 **                      |
-      |                                                               **                        |
-      |                                                            ***                          |
-      |                                                          **                             |
-  0.6 ++                                                       **                              ++
-      |                                                     ***                                 |
-      |                                                   **                                    |
-      |                                                ***                                      |
-      |                                              **                                         |
-      |                                            **                                           |
-      |                                         ***                                             |
-  0.4 ++                                      **                                               ++
-      |                                     **                                                  |
-      |                                  ***                                                    |
-      |                                **                                                       |
-      |                              **                                                         |
-      |                           ***                                                           |
-      |                         **                                                              |
-  0.2 ++                      **                                                               ++
-      |                    ***                                                                  |
-      |                  **                                                                     |
-      |                **                                                                       |
-      |             ***                                                                         |
-      |           **                                                                            |
-      |       + **             +               +               +                +               +
-    0 ++------A*---------------+---------------+---------------+----------------+--------------++
-              1               1.2             1.4             1.6              1.8              2
-
-
-
-    2 ++------+----------------+---------------+---------------+----------------+--------------*A
-      |       +                +               +               +                +            ** +
-      |                                                                                    **   |
-      |                                                                                 ***     |
-      |                                                                               **        |
-      |                                                                             **          |
-      |                                                                          ***            |
-  1.8 ++                                                                       **              ++
-      |                                                                      **                 |
-      |                                                                   ***                   |
-      |                                                                 **                      |
-      |                                                               **                        |
-      |                                                            ***                          |
-      |                                                          **                             |
-  1.6 ++                                                       **                              ++
-      |                                                     ***                                 |
-      |                                                   **                                    |
-      |                                                ***                                      |
-      |                                              **                                         |
-      |                                            **                                           |
-      |                                         ***                                             |
-  1.4 ++                                      **                                               ++
-      |                                     **                                                  |
-      |                                  ***                                                    |
-      |                                **                                                       |
-      |                              **                                                         |
-      |                           ***                                                           |
-      |                         **                                                              |
-  1.2 ++                      **                                                               ++
-      |                    ***                                                                  |
-      |                  **                                                                     |
-      |                **                                                                       |
-      |             ***                                                                         |
-      |           **                                                                            |
-      |       + **             +               +               +                +               +
-    1 ++------A*---------------+---------------+---------------+----------------+--------------++
-              2               2.2             2.4             2.6              2.8              3
-
-EOF
+         refplot  => 'streaming-with-xlen.ref' );
 
 tryplot( testname => 'streaming with --monotonic',
          cmd      => q{seq 500 | gawk '{if(NR==11) {print "exit";} else {x=(NR-1)%5; if(x==0) {print -1,-1;} print x,NR;}; fflush(); system("sleep 0.6");}'},
          options  => [qw(--lines --points --stream 0.4 --domain --monotonic)],
-         refplot  => <<'EOF' );
-
-
-    1 ++----------------+-----------------+-----------------+-----------------+----------------*A
-      +                 +                 +                 +                 +              ** +
-      |                                                                                   ***   |
-      |                                                                                ***      |
-      |                                                                              **         |
-      |                                                                           ***           |
-      |                                                                         **              |
-      |                                                                      ***                |
-      |                                                                    **                   |
-  0.5 ++                                                                ***                    ++
-      |                                                              ***                        |
-      |                                                            **                           |
-      |                                                         ***                             |
-      |                                                       **                                |
-      |                                                    ***                                  |
-      |                                                  **                                     |
-      |                                               ***                                       |
-    0 ++                                           ***                                         ++
-      |                                          **                                             |
-      |                                       ***                                               |
-      |                                     **                                                  |
-      |                                  ***                                                    |
-      |                                **                                                       |
-      |                             ***                                                         |
-      |                          ***                                                            |
-      |                        **                                                               |
- -0.5 ++                    ***                                                                ++
-      |                   **                                                                    |
-      |                ***                                                                      |
-      |              **                                                                         |
-      |           ***                                                                           |
-      |        ***                                                                              |
-      |      **                                                                                 |
-      |   ***                                                                                   |
-      + **              +                 +                 +                 +                 +
-   -1 A*----------------+-----------------+-----------------+-----------------+----------------++
-     -1               -0.8              -0.6              -0.4              -0.2                0
-
-
-
-    2 ++---------------------+---------------------+----------------------+--------------------*A
-      +                      +                     +                      +                **** +
-      |                                                                                ****     |
-      |                                                                            ****         |
-      |                                                                         ***             |
-      |                                                                     ****                |
-  1.5 ++                                                                ****                   ++
-      |                                                             ****                        |
-      |                                                          ***                            |
-      |                                                      ****                               |
-      |                                                  ****                                   |
-      |                                              ****                                       |
-    1 ++                                           A*                                          ++
-      |                                          **                                             |
-      |                                        **                                               |
-      |                                      **                                                 |
-      |                                    **                                                   |
-  0.5 ++                                 **                                                    ++
-      |                                **                                                       |
-      |                              **                                                         |
-      |                            **                                                           |
-      |                          **                                                             |
-      |                        **                                                               |
-    0 ++                     **                                                                ++
-      |                    **                                                                   |
-      |                  **                                                                     |
-      |                **                                                                       |
-      |              **                                                                         |
-      |            **                                                                           |
- -0.5 ++         **                                                                            ++
-      |        **                                                                               |
-      |      **                                                                                 |
-      |    **                                                                                   |
-      |  **                                                                                     |
-      +**                    +                     +                      +                     +
-   -1 A+---------------------+---------------------+----------------------+--------------------++
-     -1                    -0.5                    0                     0.5                    1
-
-
-
-    3 ++-------------+--------------+--------------+--------------+--------------+-------------*A
-      +              +              +              +              +              +         **** +
-      |                                                                                 ***     |
-      |                                                                              ***        |
-  2.5 ++                                                                         ****          ++
-      |                                                                       ***               |
-      |                                                                    ***                  |
-      |                                                                ****                     |
-      |                                                             ***                         |
-    2 ++                                                         *A*                           ++
-      |                                                      ****                               |
-      |                                                  ****                                   |
-      |                                              ****                                       |
-  1.5 ++                                          ***                                          ++
-      |                                       ****                                              |
-      |                                   ****                                                  |
-      |                               ****                                                      |
-    1 ++                            A*                                                         ++
-      |                           **                                                            |
-      |                         **                                                              |
-      |                        *                                                                |
-      |                      **                                                                 |
-  0.5 ++                   **                                                                  ++
-      |                   *                                                                     |
-      |                 **                                                                      |
-      |               **                                                                        |
-    0 ++             *                                                                         ++
-      |            **                                                                           |
-      |          **                                                                             |
-      |         *                                                                               |
-      |       **                                                                                |
- -0.5 ++    **                                                                                 ++
-      |    *                                                                                    |
-      |  **                                                                                     |
-      +**            +              +              +              +              +              +
-   -1 A+-------------+--------------+--------------+--------------+--------------+-------------++
-     -1            -0.5             0             0.5             1             1.5             2
-
-
-
-  4 ++----------+----------+-----------+----------+-----------+----------+-----------+---------*A
-    +           +          +           +          +           +          +           +      *** +
-    |                                                                                   ****    |
-    |                                                                                ***        |
-    |                                                                             ***           |
-    |                                                                         ****              |
-    |                                                                      ***                  |
-  3 ++                                                                  *A*                    ++
-    |                                                                ***                        |
-    |                                                            ****                           |
-    |                                                         ***                               |
-    |                                                      ***                                  |
-    |                                                  ****                                     |
-    |                                               ***                                         |
-  2 ++                                           *A*                                           ++
-    |                                         ***                                               |
-    |                                     ****                                                  |
-    |                                  ***                                                      |
-    |                               ***                                                         |
-    |                           ****                                                            |
-    |                        ***                                                                |
-  1 ++                     A*                                                                  ++
-    |                    **                                                                     |
-    |                  **                                                                       |
-    |                 *                                                                         |
-    |               **                                                                          |
-    |             **                                                                            |
-    |            *                                                                              |
-  0 ++         **                                                                              ++
-    |         *                                                                                 |
-    |       **                                                                                  |
-    |     **                                                                                    |
-    |    *                                                                                      |
-    |  **                                                                                       |
-    +**         +          +           +          +           +          +           +          +
- -1 A+----------+----------+-----------+----------+-----------+----------+-----------+---------++
-   -1         -0.5         0          0.5         1          1.5         2          2.5         3
-
-
-
-  5 ++----------------+------------------+-----------------+------------------+----------------*A
-    +                 +                  +                 +                  +             *** +
-    |                                                                                    ***    |
-    |                                                                                 ***       |
-    |                                                                              ***          |
-    |                                                                           ***             |
-  4 ++                                                                       *A*               ++
-    |                                                                     ***                   |
-    |                                                                  ***                      |
-    |                                                              ****                         |
-    |                                                           ***                             |
-    |                                                        ***                                |
-  3 ++                                                    *A*                                  ++
-    |                                                 ****                                      |
-    |                                             ****                                          |
-    |                                          ***                                              |
-    |                                      ****                                                 |
-  2 ++                                  *A*                                                    ++
-    |                                ***                                                        |
-    |                             ***                                                           |
-    |                         ****                                                              |
-    |                      ***                                                                  |
-    |                   ***                                                                     |
-  1 ++                A*                                                                       ++
-    |               **                                                                          |
-    |              *                                                                            |
-    |            **                                                                             |
-    |           *                                                                               |
-    |         **                                                                                |
-  0 ++       *                                                                                 ++
-    |      **                                                                                   |
-    |     *                                                                                     |
-    |   **                                                                                      |
-    |  *                                                                                        |
-    +**               +                  +                 +                  +                 +
- -1 A+----------------+------------------+-----------------+------------------+----------------++
-   -1                 0                  1                 2                  3                 4
-
-
-
-  6 ++----------------+------------------+-----------------+------------------+----------------*A
-    +                 +                  +                 +                  +              ** +
-    |                                                                                     ***   |
-    |                                                                                  ***      |
-    |                                                                                **         |
-  5 ++                                                                            ***          ++
-    |                                                                          ***              |
-    |                                                                        **                 |
-    |                                                                     ***                   |
-    |                                                                   **                      |
-  4 ++                                                               ***                       ++
-    |                                                             ***                           |
-    |                                                           **                              |
-    |                                                        ***                                |
-    |                                                     ***                                   |
-  3 ++                                                  **                                     ++
-    |                                                ***                                        |
-    |                                             ***                                           |
-    |                                           **                                              |
-    |                                        ***                                                |
-  2 ++                                     **                                                  ++
-    |                                   ***                                                     |
-    |                                ***                                                        |
-    |                              **                                                           |
-    |                           ***                                                             |
-  1 ++                       ***                                                               ++
-    |                      **                                                                   |
-    |                   ***                                                                     |
-    |                 **                                                                        |
-    |              ***                                                                          |
-  0 ++          ***                                                                            ++
-    |         **                                                                                |
-    |      ***                                                                                  |
-    |   ***                                                                                     |
-    + **              +                  +                 +                  +                 +
- -1 A*----------------+------------------+-----------------+------------------+----------------++
-   -1               -0.8               -0.6              -0.4               -0.2                0
-
-
-
-  7 ++---------------------+----------------------+----------------------+-----------------*****A
-    +                      +                      +                      +     ************     +
-    |                                                               ***********                 |
-    |                                                   ************                            |
-  6 ++                                            A*****                                       ++
-    |                                           **                                              |
-    |                                          *                                                |
-    |                                        **                                                 |
-    |                                       *                                                   |
-  5 ++                                    **                                                   ++
-    |                                    *                                                      |
-    |                                  **                                                       |
-    |                                 *                                                         |
-  4 ++                              **                                                         ++
-    |                              *                                                            |
-    |                            **                                                             |
-    |                           *                                                               |
-  3 ++                        **                                                               ++
-    |                        *                                                                  |
-    |                      **                                                                   |
-    |                     *                                                                     |
-    |                    *                                                                      |
-  2 ++                 **                                                                      ++
-    |                 *                                                                         |
-    |               **                                                                          |
-    |              *                                                                            |
-  1 ++           **                                                                            ++
-    |           *                                                                               |
-    |         **                                                                                |
-    |        *                                                                                  |
-    |      **                                                                                   |
-  0 ++    *                                                                                    ++
-    |   **                                                                                      |
-    |  *                                                                                        |
-    +**                    +                      +                      +                      +
- -1 A+---------------------+----------------------+----------------------+---------------------++
-   -1                    -0.5                     0                     0.5                     1
-
-
-
-  8 ++-------------+---------------+--------------+--------------+---------------+-----------***A
-    +              +               +              +              +               +   ********   +
-    |                                                                        ********           |
-    |                                                                ********                   |
-  7 ++                                                        ***A***                          ++
-    |                                                 ********                                  |
-    |                                          *******                                          |
-    |                                  ********                                                 |
-  6 ++                             A***                                                        ++
-    |                             *                                                             |
-    |                            *                                                              |
-    |                          **                                                               |
-  5 ++                        *                                                                ++
-    |                        *                                                                  |
-    |                       *                                                                   |
-    |                      *                                                                    |
-  4 ++                    *                                                                    ++
-    |                    *                                                                      |
-    |                  **                                                                       |
-  3 ++                *                                                                        ++
-    |                *                                                                          |
-    |               *                                                                           |
-    |              *                                                                            |
-  2 ++            *                                                                            ++
-    |            *                                                                              |
-    |          **                                                                               |
-    |         *                                                                                 |
-  1 ++       *                                                                                 ++
-    |       *                                                                                   |
-    |      *                                                                                    |
-    |     *                                                                                     |
-  0 ++   *                                                                                     ++
-    |  **                                                                                       |
-    | *                                                                                         |
-    +*             +               +              +              +               +              +
- -1 A+-------------+---------------+--------------+--------------+---------------+-------------++
-   -1            -0.5              0             0.5             1              1.5             2
-
-
-
-  10 ++---------+-----------+----------+-----------+----------+----------+-----------+---------++
-     +          +           +          +           +          +          +           +          +
-     |                                                                                          |
-     |                                                                                       ***A
-     |                                                                               ********   |
-     |                                                                       ********           |
-   8 ++                                                               ***A***                  ++
-     |                                                        ********                          |
-     |                                                 *******                                  |
-     |                                          ***A***                                         |
-     |                                  ********                                                |
-     |                          ********                                                        |
-   6 ++                     A***                                                               ++
-     |                     *                                                                    |
-     |                    *                                                                     |
-     |                  **                                                                      |
-     |                 *                                                                        |
-   4 ++               *                                                                        ++
-     |               *                                                                          |
-     |              *                                                                           |
-     |             *                                                                            |
-     |            *                                                                             |
-     |          **                                                                              |
-   2 ++        *                                                                               ++
-     |        *                                                                                 |
-     |       *                                                                                  |
-     |      *                                                                                   |
-     |     *                                                                                    |
-     |    *                                                                                     |
-   0 ++ **                                                                                     ++
-     | *                                                                                        |
-     |*                                                                                         |
-     A                                                                                          |
-     |                                                                                          |
-     +          +           +          +           +          +          +           +          +
-  -2 ++---------+-----------+----------+-----------+----------+----------+-----------+---------++
-    -1        -0.5          0         0.5          1         1.5         2          2.5         3
-
-
-
-  10 ++----------------+-----------------+------------------+-----------------+--------------***A
-     +                 +                 +                  +                 +        ******   +
-     |                                                                           ******         |
-     |                                                                     ***A**               |
-     |                                                               ******                     |
-     |                                                         ******                           |
-   8 ++                                                  ***A**                                ++
-     |                                             ******                                       |
-     |                                       ******                                             |
-     |                                ***A***                                                   |
-     |                          ******                                                          |
-     |                    ******                                                                |
-   6 ++                A**                                                                     ++
-     |                *                                                                         |
-     |               *                                                                          |
-     |              *                                                                           |
-     |             *                                                                            |
-   4 ++            *                                                                           ++
-     |            *                                                                             |
-     |           *                                                                              |
-     |          *                                                                               |
-     |         *                                                                                |
-     |        *                                                                                 |
-   2 ++      *                                                                                 ++
-     |      *                                                                                   |
-     |     *                                                                                    |
-     |    *                                                                                     |
-     |    *                                                                                     |
-     |   *                                                                                      |
-   0 ++ *                                                                                      ++
-     | *                                                                                        |
-     |*                                                                                         |
-     A                                                                                          |
-     |                                                                                          |
-     +                 +                 +                  +                 +                 +
-  -2 ++----------------+-----------------+------------------+-----------------+----------------++
-    -1                 0                 1                  2                 3                 4
-
-EOF
+         refplot  => 'streaming-with-monotonic.ref' );
 
 tryplot( testname => '--timefmt streaming plot with --xlen',
          cmd      => q{seq 5 | gawk 'BEGIN{ print strftime("%d %b %Y %T",1382249107-1,1),-4;} {if(NR==3) {print "exit";} else{ print strftime("%d %b %Y %T",1382249107+$1,1),$1;} fflush(); system("sleep 0.6")}'},
          options  => ['--points', '--lines',
                       '--domain', '--timefmt', '%d %b %Y %H:%M:%S',
                       qw(--stream 0.4 --xlen 3)],
-         refplot  => <<'EOF' );
-
-
-  1 ++-------------+---------------+--------------+--------------+---------------+-------------+A
-    +              +               +              +              +               +            **+
-    |                                                                                       **  |
-    |                                                                                     **    |
-    |                                                                                    *      |
-    |                                                                                  **       |
-    |                                                                                **         |
-  0 ++                                                                             **          ++
-    |                                                                             *             |
-    |                                                                           **              |
-    |                                                                         **                |
-    |                                                                       **                  |
-    |                                                                      *                    |
-    |                                                                    **                     |
- -1 ++                                                                 **                      ++
-    |                                                                **                         |
-    |                                                               *                           |
-    |                                                             **                            |
-    |                                                           **                              |
-    |                                                          *                                |
-    |                                                        **                                 |
- -2 ++                                                     **                                  ++
-    |                                                    **                                     |
-    |                                                   *                                       |
-    |                                                 **                                        |
-    |                                               **                                          |
-    |                                             **                                            |
-    |                                            *                                              |
- -3 ++                                         **                                              ++
-    |                                        **                                                 |
-    |                                      **                                                   |
-    |                                     *                                                     |
-    |                                   **                                                      |
-    |                                 **                                                        |
-    +              +               +**            +              +               +              +
- -4 ++-------------+---------------A--------------+--------------+---------------+-------------++
-  05:05          05:05           05:06          05:06          05:07           05:07          05:08
-
-
-
-  2 ++-------------+---------------+--------------+--------------+---------------+------------**A
-    +              +               +              +              +               +       *****  +
-    |                                                                               *****       |
-    |                                                                         ******            |
-    |                                                                    *****                  |
-    |                                                               *****                       |
-  1 ++                                                          *A**                           ++
-    |                                                         **                                |
-    |                                                       **                                  |
-    |                                                     **                                    |
-    |                                                   **                                      |
-    |                                                 **                                        |
-  0 ++                                              **                                         ++
-    |                                             **                                            |
-    |                                           **                                              |
-    |                                         **                                                |
-    |                                      ***                                                  |
- -1 ++                                   **                                                    ++
-    |                                  **                                                       |
-    |                                **                                                         |
-    |                              **                                                           |
-    |                            **                                                             |
-    |                          **                                                               |
- -2 ++                       **                                                                ++
-    |                      **                                                                   |
-    |                   ***                                                                     |
-    |                 **                                                                        |
-    |               **                                                                          |
-    |             **                                                                            |
- -3 ++          **                                                                             ++
-    |         **                                                                                |
-    |       **                                                                                  |
-    |     **                                                                                    |
-    |   **                                                                                      |
-    + **           +               +              +              +               +              +
- -4 A*-------------+---------------+--------------+--------------+---------------+-------------++
-  05:06          05:06           05:07          05:07          05:08           05:08          05:09
-
-EOF
+         refplot  => 'timefmt-streaming-plot-with-xlen.ref' );
 
 tryplot( testname => '--timefmt streaming plot with --monotonic',
          cmd      => q{seq 10 | gawk '{x=(NR-1)%5; if(x==0) {print strftime("%d %b %Y %T",1382249107-1,-4),-4;} print strftime("%d %b %Y %T",1382249107+x,1),NR; fflush(); system("sleep 0.6")}'},
          options  => ['--points', '--lines',
                       '--domain', '--timefmt', '%d %b %Y %H:%M:%S',
                       qw(--stream 0.4 --monotonic)],
-         refplot  => <<'EOF' );
-
-
-  1 ++----------------+------------------+-----------------+------------------+----------------*A
-    +                 +                  +                 +                  +              ** +
-    |                                                                                     ***   |
-    |                                                                                  ***      |
-    |                                                                                **         |
-    |                                                                             ***           |
-    |                                                                          ***              |
-  0 ++                                                                       **                ++
-    |                                                                     ***                   |
-    |                                                                   **                      |
-    |                                                                ***                        |
-    |                                                             ***                           |
-    |                                                           **                              |
-    |                                                        ***                                |
- -1 ++                                                    ***                                  ++
-    |                                                   **                                      |
-    |                                                ***                                        |
-    |                                             ***                                           |
-    |                                           **                                              |
-    |                                        ***                                                |
-    |                                      **                                                   |
- -2 ++                                  ***                                                    ++
-    |                                ***                                                        |
-    |                              **                                                           |
-    |                           ***                                                             |
-    |                        ***                                                                |
-    |                      **                                                                   |
-    |                   ***                                                                     |
- -3 ++                **                                                                       ++
-    |              ***                                                                          |
-    |           ***                                                                             |
-    |         **                                                                                |
-    |      ***                                                                                  |
-    |   ***                                                                                     |
-    + **              +                  +                 +                  +                 +
- -4 A*----------------+------------------+-----------------+------------------+----------------++
-  05:06             05:06              05:06             05:06              05:06             05:06
-
-
-
-  2 ++---------------------+----------------------+----------------------+-------------------***A
-    +                      +                      +                      +           ********   +
-    |                                                                        ********           |
-    |                                                                 *******                   |
-    |                                                         ********                          |
-    |                                                 ********                                  |
-  1 ++                                            A***                                         ++
-    |                                           **                                              |
-    |                                          *                                                |
-    |                                        **                                                 |
-    |                                      **                                                   |
-    |                                     *                                                     |
-  0 ++                                  **                                                     ++
-    |                                  *                                                        |
-    |                                **                                                         |
-    |                              **                                                           |
-    |                             *                                                             |
- -1 ++                          **                                                             ++
-    |                          *                                                                |
-    |                        **                                                                 |
-    |                      **                                                                   |
-    |                     *                                                                     |
-    |                   **                                                                      |
- -2 ++                 *                                                                       ++
-    |                **                                                                         |
-    |               *                                                                           |
-    |             **                                                                            |
-    |           **                                                                              |
-    |          *                                                                                |
- -3 ++       **                                                                                ++
-    |       *                                                                                   |
-    |     **                                                                                    |
-    |   **                                                                                      |
-    |  *                                                                                        |
-    +**                    +                      +                      +                      +
- -4 A+---------------------+----------------------+----------------------+---------------------++
-  05:06                  05:06                  05:07                  05:07                  05:08
-
-
-
-  3 ++-------------+---------------+--------------+--------------+---------------+-----------***A
-    +              +               +              +              +               +     ******   +
-    |                                                                            ******         |
-    |                                                                      ******               |
-    |                                                                ******                     |
-  2 ++                                                        ***A***                          ++
-    |                                                   ******                                  |
-    |                                             ******                                        |
-    |                                       ******                                              |
-    |                                 ******                                                    |
-  1 ++                             A**                                                         ++
-    |                             *                                                             |
-    |                           **                                                              |
-    |                          *                                                                |
-    |                         *                                                                 |
-  0 ++                       *                                                                 ++
-    |                      **                                                                   |
-    |                     *                                                                     |
-    |                    *                                                                      |
-    |                   *                                                                       |
- -1 ++                **                                                                       ++
-    |                *                                                                          |
-    |               *                                                                           |
-    |              *                                                                            |
-    |             *                                                                             |
- -2 ++          **                                                                             ++
-    |          *                                                                                |
-    |         *                                                                                 |
-    |        *                                                                                  |
-    |      **                                                                                   |
- -3 ++    *                                                                                    ++
-    |    *                                                                                      |
-    |   *                                                                                       |
-    | **                                                                                        |
-    +*             +               +              +              +               +              +
- -4 A+-------------+---------------+--------------+--------------+---------------+-------------++
-  05:06          05:06           05:07          05:07          05:08           05:08          05:09
-
-
-
-  4 ++----------+----------+-----------+----------+-----------+----------+-----------+--------**A
-    +           +          +           +          +           +          +           +  ******  +
-    |                                                                             ******        |
-    |                                                                       ******              |
-  3 ++                                                                 **A**                   ++
-    |                                                              ****                         |
-    |                                                         *****                             |
-    |                                                    *****                                  |
-    |                                                ****                                       |
-  2 ++                                          **A**                                          ++
-    |                                     ******                                                |
-    |                               ******                                                      |
-    |                         ******                                                            |
-  1 ++                     A**                                                                 ++
-    |                     *                                                                     |
-    |                    *                                                                      |
-    |                   *                                                                       |
-  0 ++                 *                                                                       ++
-    |                 *                                                                         |
-    |                *                                                                          |
-    |               *                                                                           |
-    |              *                                                                            |
- -1 ++            *                                                                            ++
-    |            *                                                                              |
-    |          **                                                                               |
-    |         *                                                                                 |
- -2 ++       *                                                                                 ++
-    |       *                                                                                   |
-    |      *                                                                                    |
-    |     *                                                                                     |
-    |    *                                                                                      |
- -3 ++  *                                                                                      ++
-    |  *                                                                                        |
-    | *                                                                                         |
-    +*          +          +           +          +           +          +           +          +
- -4 A+----------+----------+-----------+----------+-----------+----------+-----------+---------++
-  05:06       05:06      05:07       05:07      05:08       05:08      05:09       05:09      05:10
-
-
-
-  5 ++----------------+------------------+-----------------+------------------+---------------**A
-    +                 +                  +                 +                  +           ****  +
-    |                                                                                *****      |
-    |                                                                            ****           |
-  4 ++                                                                      **A**              ++
-    |                                                                  *****                    |
-    |                                                              ****                         |
-    |                                                         *****                             |
-  3 ++                                                   **A**                                 ++
-    |                                                ****                                       |
-    |                                           *****                                           |
-    |                                       ****                                                |
-  2 ++                                 **A**                                                   ++
-    |                             *****                                                         |
-    |                         ****                                                              |
-    |                    *****                                                                  |
-  1 ++                A**                                                                      ++
-    |                *                                                                          |
-    |               *                                                                           |
-  0 ++             *                                                                           ++
-    |             *                                                                             |
-    |            *                                                                              |
-    |           *                                                                               |
- -1 ++         *                                                                               ++
-    |         *                                                                                 |
-    |        *                                                                                  |
-    |        *                                                                                  |
- -2 ++      *                                                                                  ++
-    |      *                                                                                    |
-    |     *                                                                                     |
-    |    *                                                                                      |
- -3 ++  *                                                                                      ++
-    |  *                                                                                        |
-    | *                                                                                         |
-    +*                +                  +                 +                  +                 +
- -4 A+----------------+------------------+-----------------+------------------+----------------++
-  05:06             05:07              05:08             05:09              05:10             05:11
-
-
-
-  6 ++----------------+------------------+-----------------+------------------+----------------*A
-    +                 +                  +                 +                  +              ** +
-    |                                                                                     ***   |
-    |                                                                                  ***      |
-    |                                                                                **         |
-    |                                                                             ***           |
-    |                                                                          ***              |
-  4 ++                                                                       **                ++
-    |                                                                     ***                   |
-    |                                                                   **                      |
-    |                                                                ***                        |
-    |                                                             ***                           |
-    |                                                           **                              |
-    |                                                        ***                                |
-  2 ++                                                    ***                                  ++
-    |                                                   **                                      |
-    |                                                ***                                        |
-    |                                             ***                                           |
-    |                                           **                                              |
-    |                                        ***                                                |
-    |                                      **                                                   |
-  0 ++                                  ***                                                    ++
-    |                                ***                                                        |
-    |                              **                                                           |
-    |                           ***                                                             |
-    |                        ***                                                                |
-    |                      **                                                                   |
-    |                   ***                                                                     |
- -2 ++                **                                                                       ++
-    |              ***                                                                          |
-    |           ***                                                                             |
-    |         **                                                                                |
-    |      ***                                                                                  |
-    |   ***                                                                                     |
-    + **              +                  +                 +                  +                 +
- -4 A*----------------+------------------+-----------------+------------------+----------------++
-  05:06             05:06              05:06             05:06              05:06             05:06
-
-
-
-  8 ++---------------------+----------------------+----------------------+---------------------++
-    +                      +                      +                      +                      +
-    |                                                                                           |
-    |                                                                                    *******A
-    |                                                                    ****************       |
-    |                                                     ***************                       |
-  6 ++                                            A*******                                     ++
-    |                                           **                                              |
-    |                                          *                                                |
-    |                                        **                                                 |
-    |                                      **                                                   |
-    |                                     *                                                     |
-  4 ++                                  **                                                     ++
-    |                                  *                                                        |
-    |                                **                                                         |
-    |                              **                                                           |
-    |                             *                                                             |
-  2 ++                          **                                                             ++
-    |                          *                                                                |
-    |                        **                                                                 |
-    |                      **                                                                   |
-    |                     *                                                                     |
-    |                   **                                                                      |
-  0 ++                 *                                                                       ++
-    |                **                                                                         |
-    |               *                                                                           |
-    |             **                                                                            |
-    |           **                                                                              |
-    |          *                                                                                |
- -2 ++       **                                                                                ++
-    |       *                                                                                   |
-    |     **                                                                                    |
-    |   **                                                                                      |
-    |  *                                                                                        |
-    +**                    +                      +                      +                      +
- -4 A+---------------------+----------------------+----------------------+---------------------++
-  05:06                  05:06                  05:07                  05:07                  05:08
-
-
-
-  8 ++-------------+---------------+--------------+--------------+---------------+---------*****A
-    +              +               +              +              +               **********     +
-    |                                                                  **********               |
-    |                                                       *****A*****                         |
-    |                                             **********                                    |
-    |                                   **********                                              |
-  6 ++                             A****                                                       ++
-    |                             *                                                             |
-    |                            *                                                              |
-    |                           *                                                               |
-    |                          *                                                                |
-    |                         *                                                                 |
-  4 ++                       *                                                                 ++
-    |                      **                                                                   |
-    |                     *                                                                     |
-    |                    *                                                                      |
-    |                   *                                                                       |
-  2 ++                 *                                                                       ++
-    |                 *                                                                         |
-    |                *                                                                          |
-    |               *                                                                           |
-    |              *                                                                            |
-    |             *                                                                             |
-  0 ++           *                                                                             ++
-    |           *                                                                               |
-    |          *                                                                                |
-    |         *                                                                                 |
-    |        *                                                                                  |
-    |      **                                                                                   |
- -2 ++    *                                                                                    ++
-    |    *                                                                                      |
-    |   *                                                                                       |
-    |  *                                                                                        |
-    | *                                                                                         |
-    +*             +               +              +              +               +              +
- -4 A+-------------+---------------+--------------+--------------+---------------+-------------++
-  05:06          05:06           05:07          05:07          05:08           05:08          05:09
-
-
-
-  10 ++---------+-----------+----------+-----------+----------+----------+-----------+---------++
-     +          +           +          +           +          +          +           +          +
-     |                                                                                       ***A
-     |                                                                               ********   |
-     |                                                                       ********           |
-   8 ++                                                             *****A***                  ++
-     |                                                   ***********                            |
-     |                                          ***A*****                                       |
-     |                                  ********                                                |
-     |                          ********                                                        |
-   6 ++                     A***                                                               ++
-     |                     *                                                                    |
-     |                    *                                                                     |
-     |                   *                                                                      |
-     |                  *                                                                       |
-   4 ++                *                                                                       ++
-     |                *                                                                         |
-     |                *                                                                         |
-     |               *                                                                          |
-     |              *                                                                           |
-   2 ++            *                                                                           ++
-     |            *                                                                             |
-     |           *                                                                              |
-     |          *                                                                               |
-     |         *                                                                                |
-   0 ++       *                                                                                ++
-     |       *                                                                                  |
-     |      *                                                                                   |
-     |     *                                                                                    |
-     |     *                                                                                    |
-  -2 ++   *                                                                                    ++
-     |   *                                                                                      |
-     |  *                                                                                       |
-     | *                                                                                        |
-     +*         +           +          +           +          +          +           +          +
-  -4 A+---------+-----------+----------+-----------+----------+----------+-----------+---------++
-   05:06      05:06       05:07      05:07       05:08      05:08      05:09       05:09      05:10
-
-
-
-  10 ++----------------+-----------------+------------------+-----------------+-------------****A
-     +                 +                 +                  +                 +    *********    +
-     |                                                                     ***A****             |
-     |                                                               ******                     |
-     |                                                         ******                           |
-   8 ++                                                 ****A**                                ++
-     |                                        **********                                        |
-     |                                ***A****                                                  |
-     |                          ******                                                          |
-     |                    ******                                                                |
-   6 ++                A**                                                                     ++
-     |                *                                                                         |
-     |                *                                                                         |
-     |               *                                                                          |
-     |              *                                                                           |
-   4 ++            *                                                                           ++
-     |             *                                                                            |
-     |            *                                                                             |
-     |           *                                                                              |
-     |           *                                                                              |
-   2 ++         *                                                                              ++
-     |         *                                                                                |
-     |        *                                                                                 |
-     |        *                                                                                 |
-     |       *                                                                                  |
-   0 ++     *                                                                                  ++
-     |     *                                                                                    |
-     |     *                                                                                    |
-     |    *                                                                                     |
-     |   *                                                                                      |
-  -2 ++  *                                                                                     ++
-     |  *                                                                                       |
-     | *                                                                                        |
-     |*                                                                                         |
-     +*                +                 +                  +                 +                 +
-  -4 A+----------------+-----------------+------------------+-----------------+----------------++
-   05:06             05:07             05:08              05:09             05:10             05:11
-
-EOF
+         refplot  => 'timefmt-streaming-plot-with-monotonic.ref' );
 
 }
 
@@ -2331,15 +377,58 @@ sub tryplot
                  '--terminal', 'dumb 100,40');
   unshift @options, @{$args{options}};
 
-  my $feedgnuplot = dirname($0) . "/../bin/feedgnuplot";
+  my $feedgnuplot = "$Bin/../bin/feedgnuplot";
+
+  note( "Running test '$args{testname}'. Running: $args{cmd} | $feedgnuplot " .
+        shell_quote(@options));
+
   my $out = '';
   my $err = '';
   open IN, '-|', $args{cmd} or die "Couldn't open pipe to $args{cmd}";
   run [$feedgnuplot, @options],
     \*IN, \$out, \$err;
 
-  note( "Running test '$args{testname}'. Running: $args{cmd} | $feedgnuplot " .
-        shell_quote(@options));
-  is($err, '',             "$args{testname} stderr" );
-  is($out, $args{refplot}, "$args{testname} stdout");
+  # Ignore any screen refresh characters gnuplot may be outputting
+  $out =~ s/\s*\n//g;
+
+  # Don't complain about mismatched benign warnings
+  $err =~ s/^.*?warning: empty [xy] range.*?$\\n//gmi;
+
+  my $refplot_filename = "$Bin/$args{refplot}";
+  my $refplot_data     = readfile($refplot_filename);
+
+  is($err, '',                    "$args{testname} stderr" );
+  is("\n$out", "\n$refplot_data", "$args{testname} stdout");
+
+  # Enable, to replace the reference plots with what we observe
+  if(0)
+  {
+      if ($out ne $refplot_data)
+      {
+          print("Overwrite '$refplot_filename'? ");
+          my $x = <STDIN>;
+          chomp $x;
+          if ( !(!$x || $x =~ /^no?$/i) )
+          {
+              open my $fd, '>', $refplot_filename
+                or die "Couldn't open '$refplot_filename' for writing";
+              print $fd $out;
+              close $fd;
+
+              print("Overwrote '$refplot_filename'\n");
+          }
+      }
+      print("\n\n");
+  }
+}
+
+sub readfile
+{
+    my $path = $_[0];
+
+    open my $fd, '<', $path or return '';
+    local $/ = undef;
+    my $dat = <$fd>;
+    close $fd;
+    return $dat;
 }
diff --git a/t/streaming-with-monotonic.ref b/t/streaming-with-monotonic.ref
new file mode 100644
index 0000000..f02a990
--- /dev/null
+++ b/t/streaming-with-monotonic.ref
@@ -0,0 +1,390 @@
+  -0.99 +---------------------------------------------------------------------------------------+   
+        |                     +                     +                     +                     |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+ -0.995 |-+                                                                                   +-|   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+     -1 |-+                                         A                                         +-|   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+ -1.005 |-+                                                                                   +-|   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                     +                     +                     +                     |   
+  -1.01 +---------------------------------------------------------------------------------------+   
+      -1.01                -1.005                  -1                  -0.995                 -0.99 
+                                                                                                    
+    2 +-----------------------------------------------------------------------------------------+   
+      |                      +                     +                      +                **** |   
+      |                                                                                ****     |   
+      |                                                                            ****         |   
+      |                                                                         ***             |   
+      |                                                                     ****                |   
+  1.5 |-+                                                               ****                  +-|   
+      |                                                             ****                        |   
+      |                                                          ***                            |   
+      |                                                      ****                               |   
+      |                                                  ****                                   |   
+      |                                              ****                                       |   
+    1 |-+                                          A*                                         +-|   
+      |                                          **                                             |   
+      |                                        **                                               |   
+      |                                      **                                                 |   
+      |                                    **                                                   |   
+      |                                  **                                                     |   
+  0.5 |-+                              **                                                     +-|   
+      |                              **                                                         |   
+      |                             *                                                           |   
+      |                           **                                                            |   
+      |                         **                                                              |   
+      |                       **                                                                |   
+    0 |-+                   **                                                                +-|   
+      |                   **                                                                    |   
+      |                 **                                                                      |   
+      |               **                                                                        |   
+      |              *                                                                          |   
+      |            **                                                                           |   
+ -0.5 |-+        **                                                                           +-|   
+      |        **                                                                               |   
+      |      **                                                                                 |   
+      |    **                                                                                   |   
+      |  **                                                                                     |   
+      |**                    +                     +                      +                     |   
+   -1 +-----------------------------------------------------------------------------------------+   
+     -1                    -0.5                    0                     0.5                    1   
+                                                                                                    
+    3 +-----------------------------------------------------------------------------------------+   
+      |              +              +              +              +              +         **** |   
+      |                                                                                 ***     |   
+      |                                                                              ***        |   
+  2.5 |-+                                                                        ****         +-|   
+      |                                                                       ***               |   
+      |                                                                    ***                  |   
+      |                                                                ****                     |   
+      |                                                             ***                         |   
+    2 |-+                                                        *A*                          +-|   
+      |                                                      ****                               |   
+      |                                                   ***                                   |   
+      |                                                ***                                      |   
+  1.5 |-+                                          ****                                       +-|   
+      |                                         ***                                             |   
+      |                                      ***                                                |   
+      |                                  ****                                                   |   
+      |                               ***                                                       |   
+    1 |-+                           A*                                                        +-|   
+      |                           **                                                            |   
+      |                         **                                                              |   
+      |                        *                                                                |   
+  0.5 |-+                    **                                                               +-|   
+      |                    **                                                                   |   
+      |                   *                                                                     |   
+      |                 **                                                                      |   
+      |               **                                                                        |   
+    0 |-+            *                                                                        +-|   
+      |            **                                                                           |   
+      |          **                                                                             |   
+      |         *                                                                               |   
+ -0.5 |-+     **                                                                              +-|   
+      |     **                                                                                  |   
+      |    *                                                                                    |   
+      |  **                                                                                     |   
+      |**            +              +              +              +              +              |   
+   -1 +-----------------------------------------------------------------------------------------+   
+     -1            -0.5             0             0.5             1             1.5             2   
+                                                                                                    
+  4 +-------------------------------------------------------------------------------------------+   
+    |           +          +           +          +           +          +           +      *** |   
+    |                                                                                   ****    |   
+    |                                                                                ***        |   
+    |                                                                             ***           |   
+    |                                                                         ****              |   
+    |                                                                      ***                  |   
+  3 |-+                                                                 *A*                   +-|   
+    |                                                                ***                        |   
+    |                                                            ****                           |   
+    |                                                         ***                               |   
+    |                                                      ***                                  |   
+    |                                                  ****                                     |   
+    |                                               ***                                         |   
+  2 |-+                                          *A*                                          +-|   
+    |                                         ***                                               |   
+    |                                      ***                                                  |   
+    |                                   ***                                                     |   
+    |                                 **                                                        |   
+    |                              ***                                                          |   
+    |                           ***                                                             |   
+    |                        ***                                                                |   
+  1 |-+                    A*                                                                 +-|   
+    |                    **                                                                     |   
+    |                  **                                                                       |   
+    |                 *                                                                         |   
+    |               **                                                                          |   
+    |             **                                                                            |   
+    |            *                                                                              |   
+  0 |-+        **                                                                             +-|   
+    |         *                                                                                 |   
+    |       **                                                                                  |   
+    |     **                                                                                    |   
+    |    *                                                                                      |   
+    |  **                                                                                       |   
+    |**         +          +           +          +           +          +           +          |   
+ -1 +-------------------------------------------------------------------------------------------+   
+   -1         -0.5         0          0.5         1          1.5         2          2.5         3   
+                                                                                                    
+  5 +-------------------------------------------------------------------------------------------+   
+    |                 +                  +                 +                  +             *** |   
+    |                                                                                    ***    |   
+    |                                                                                 ***       |   
+    |                                                                              ***          |   
+    |                                                                           ***             |   
+  4 |-+                                                                      *A*              +-|   
+    |                                                                     ***                   |   
+    |                                                                  ***                      |   
+    |                                                              ****                         |   
+    |                                                           ***                             |   
+    |                                                        ***                                |   
+  3 |-+                                                   *A*                                 +-|   
+    |                                                  ***                                      |   
+    |                                               ***                                         |   
+    |                                            ***                                            |   
+    |                                         ***                                               |   
+    |                                      ***                                                  |   
+  2 |-+                                 *A*                                                   +-|   
+    |                                ***                                                        |   
+    |                             ***                                                           |   
+    |                         ****                                                              |   
+    |                      ***                                                                  |   
+    |                   ***                                                                     |   
+  1 |-+               A*                                                                      +-|   
+    |               **                                                                          |   
+    |              *                                                                            |   
+    |            **                                                                             |   
+    |           *                                                                               |   
+    |         **                                                                                |   
+  0 |-+      *                                                                                +-|   
+    |      **                                                                                   |   
+    |     *                                                                                     |   
+    |   **                                                                                      |   
+    |  *                                                                                        |   
+    |**               +                  +                 +                  +                 |   
+ -1 +-------------------------------------------------------------------------------------------+   
+   -1                 0                  1                 2                  3                 4   
+                                                                                                    
+  -0.99 +---------------------------------------------------------------------------------------+   
+        |                     +                     +                     +                     |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+ -0.995 |-+                                                                                   +-|   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+     -1 |-+                                         A                                         +-|   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+ -1.005 |-+                                                                                   +-|   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                                                                                       |   
+        |                     +                     +                     +                     |   
+  -1.01 +---------------------------------------------------------------------------------------+   
+      -1.01                -1.005                  -1                  -0.995                 -0.99 
+                                                                                                    
+  7 +-------------------------------------------------------------------------------------------+   
+    |                      +                      +                      +     ************     |   
+    |                                                               ***********                 |   
+    |                                                   ************                            |   
+  6 |-+                                           A*****                                      +-|   
+    |                                           **                                              |   
+    |                                          *                                                |   
+    |                                        **                                                 |   
+    |                                       *                                                   |   
+  5 |-+                                    *                                                  +-|   
+    |                                    **                                                     |   
+    |                                   *                                                       |   
+    |                                 **                                                        |   
+  4 |-+                              *                                                        +-|   
+    |                              **                                                           |   
+    |                             *                                                             |   
+    |                            *                                                              |   
+    |                          **                                                               |   
+  3 |-+                       *                                                               +-|   
+    |                       **                                                                  |   
+    |                      *                                                                    |   
+    |                    **                                                                     |   
+  2 |-+                 *                                                                     +-|   
+    |                 **                                                                        |   
+    |                *                                                                          |   
+    |               *                                                                           |   
+    |             **                                                                            |   
+  1 |-+          *                                                                            +-|   
+    |          **                                                                               |   
+    |         *                                                                                 |   
+    |       **                                                                                  |   
+  0 |-+    *                                                                                  +-|   
+    |     *                                                                                     |   
+    |   **                                                                                      |   
+    |  *                                                                                        |   
+    |**                    +                      +                      +                      |   
+ -1 +-------------------------------------------------------------------------------------------+   
+   -1                    -0.5                     0                     0.5                     1   
+                                                                                                    
+  8 +-------------------------------------------------------------------------------------------+   
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diff --git a/t/streaming-with-xlen.ref b/t/streaming-with-xlen.ref
new file mode 100644
index 0000000..f4f669f
--- /dev/null
+++ b/t/streaming-with-xlen.ref
@@ -0,0 +1,78 @@
+    1 +-----------------------------------------------------------------------------------------+   
+      |       +                +               +               +                +               |   
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+      |                                                                                         |   
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+    2 +-----------------------------------------------------------------------------------------+   
+      |       +                +               +               +                +            ** |   
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+      |                                                                             **          |   
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+  1.8 |-+                                                                      ***            +-|   
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+      |                                                             **                          |   
+      |                                                           **                            |   
+  1.6 |-+                                                      ***                            +-|   
+      |                                                      **                                 |   
+      |                                                    **                                   |   
+      |                                                  **                                     |   
+      |                                               ***                                       |   
+      |                                             **                                          |   
+      |                                           **                                            |   
+      |                                         **                                              |   
+  1.4 |-+                                    ***                                              +-|   
+      |                                    **                                                   |   
+      |                                  **                                                     |   
+      |                               ***                                                       |   
+      |                             **                                                          |   
+      |                           **                                                            |   
+      |                         **                                                              |   
+  1.2 |-+                    ***                                                              +-|   
+      |                    **                                                                   |   
+      |                  **                                                                     |   
+      |               ***                                                                       |   
+      |             **                                                                          |   
+      |           **                                                                            |   
+      |       + **             +               +               +                +               |   
+    1 +-----------------------------------------------------------------------------------------+   
+              2               2.2             2.4             2.6              2.8              3   
+                                                                                                    
diff --git a/t/timefmt-plot-with-bounds.ref b/t/timefmt-plot-with-bounds.ref
new file mode 100644
index 0000000..48440d7
--- /dev/null
+++ b/t/timefmt-plot-with-bounds.ref
@@ -0,0 +1,39 @@
+    5 +-----------------------------------------------------------------------------------------+   
+      |                      +                     +                      +                     |   
+      |                                                                                         |   
+      |                                                                                         |   
+  4.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    4 |-+                                               A                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  3.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    3 |-+                                          A                                          +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  2.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    2 |-+                                      A                                              +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  1.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                      +                     +                      +                     |   
+    1 +-----------------------------------------------------------------------------------------+   
+    05:00                  05:05                 05:10                  05:15                 05:20 
+                                                                                                    
diff --git a/t/timefmt-plot-with-monotonic.ref b/t/timefmt-plot-with-monotonic.ref
new file mode 100644
index 0000000..fc4e485
--- /dev/null
+++ b/t/timefmt-plot-with-monotonic.ref
@@ -0,0 +1,39 @@
+   10 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +          |   
+      |                                                                                         |   
+      |                                                                                         |   
+  9.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    9 |-+                                                                 A                   +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  8.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    8 |-+                                          A                                          +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  7.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+    7 |-+                    A                                                                +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+  6.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+      |                                                                                         |   
+      |          +           +          +          +          +           +          +          |   
+    6 +-----------------------------------------------------------------------------------------+   
+    05:07      05:07       05:08      05:08      05:09      05:09       05:10      05:10      05:11 
+                                                                                                    
diff --git a/t/timefmt-streaming-plot-with-monotonic.ref b/t/timefmt-streaming-plot-with-monotonic.ref
new file mode 100644
index 0000000..727de0e
--- /dev/null
+++ b/t/timefmt-streaming-plot-with-monotonic.ref
@@ -0,0 +1,390 @@
+ -3.96 +----------------------------------------------------------------------------------------+   
+       |       +       +       +        +       +       +       +       +       +       +       |   
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+   05/01/1306/01/1307/01/1308/01/13 09/01/1310/01/1311/01/1312/01/1301/01/1402/01/1403/01/1404/01/14
+                                                                                                    
+  2 +-------------------------------------------------------------------------------------------+   
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+  1 |-+               A**                                                                     +-|   
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+                                                                                                    
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+       |                                                                                        |   
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+       |                                                                                        |   
+       |                                                                                        |   
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+       |                                                                                        |   
+       |                                                                                        |   
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+ -4.01 |-+                                                                                    +-|   
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+       |                                                                                        |   
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+                                                                                                    
+  8 +-------------------------------------------------------------------------------------------+   
+    |                      +                      +                      +                      |   
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+  6 |-+                                           A*******                                    +-|   
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+  4 |-+                                  *                                                    +-|   
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+    |                                **                                                         |   
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+    |                             **                                                            |   
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+  2 |-+                        **                                                             +-|   
+    |                         *                                                                 |   
+    |                       **                                                                  |   
+    |                      *                                                                    |   
+    |                    **                                                                     |   
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+  0 |-+               **                                                                      +-|   
+    |                *                                                                          |   
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+    |           **                                                                              |   
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+ -2 |-+      *                                                                                +-|   
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+    |              +               +              +              +               **********     |   
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+    |                           *                                                               |   
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+    |                         *                                                                 |   
+  4 |-+                      *                                                                +-|   
+    |                       *                                                                   |   
+    |                      *                                                                    |   
+    |                     *                                                                     |   
+    |                    *                                                                      |   
+    |                   *                                                                       |   
+  2 |-+                *                                                                      +-|   
+    |                 *                                                                         |   
+    |                *                                                                          |   
+    |              **                                                                           |   
+    |             *                                                                             |   
+    |            *                                                                              |   
+  0 |-+         *                                                                             +-|   
+    |          *                                                                                |   
+    |         *                                                                                 |   
+    |        *                                                                                  |   
+    |       *                                                                                   |   
+    |      *                                                                                    |   
+ -2 |-+   *                                                                                   +-|   
+    |    *                                                                                      |   
+    |   *                                                                                       |   
+    |  *                                                                                        |   
+    | *                                                                                         |   
+    |*             +               +              +              +               +              |   
+ -4 +-------------------------------------------------------------------------------------------+   
+  05:06          05:06           05:07          05:07          05:08           05:08          05:09 
+                                                                                                    
+  10 +------------------------------------------------------------------------------------------+   
+     |          +           +          +           +          +          +           +          |   
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+     |                                                                                     *****|   
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+   8 |-+                                                              ***A*****               +-|   
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+     |                                                 *******                                  |   
+     |                                        *****A***                                         |   
+     |                            ************                                                  |   
+   6 |-+                    A*****                                                            +-|   
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+     |                   *                                                                      |   
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+   4 |-+                *                                                                     +-|   
+     |                 *                                                                        |   
+     |                *                                                                         |   
+     |               *                                                                          |   
+     |              *                                                                           |   
+     |             *                                                                            |   
+   2 |-+          *                                                                           +-|   
+     |           *                                                                              |   
+     |           *                                                                              |   
+     |          *                                                                               |   
+     |         *                                                                                |   
+   0 |-+      *                                                                               +-|   
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+     |      *                                                                                   |   
+     |     *                                                                                    |   
+     |    *                                                                                     |   
+  -2 |-+ *                                                                                    +-|   
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+     |  *                                                                                       |   
+     | *                                                                                        |   
+     |*         +           +          +           +          +          +           +          |   
+  -4 +------------------------------------------------------------------------------------------+   
+   05:06      05:06       05:07      05:07       05:08      05:08      05:09       05:09      05:10 
+                                                                                                    
+  10 +------------------------------------------------------------------------------------------+   
+     |                 +                 +                  +                 +        ******   |   
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+     |                                                           *********                      |   
+   8 |-+                                                 ***A****                             +-|   
+     |                                             ******                                       |   
+     |                                       ******                                             |   
+     |                               ****A***                                                   |   
+     |                      *********                                                           |   
+   6 |-+               A****                                                                  +-|   
+     |                *                                                                         |   
+     |                *                                                                         |   
+     |               *                                                                          |   
+     |              *                                                                           |   
+   4 |-+            *                                                                         +-|   
+     |             *                                                                            |   
+     |            *                                                                             |   
+     |           *                                                                              |   
+     |           *                                                                              |   
+     |          *                                                                               |   
+   2 |-+       *                                                                              +-|   
+     |         *                                                                                |   
+     |        *                                                                                 |   
+     |       *                                                                                  |   
+     |       *                                                                                  |   
+   0 |-+    *                                                                                 +-|   
+     |     *                                                                                    |   
+     |     *                                                                                    |   
+     |    *                                                                                     |   
+     |   *                                                                                      |   
+  -2 |-+*                                                                                     +-|   
+     |  *                                                                                       |   
+     | *                                                                                        |   
+     |*                                                                                         |   
+     |*                +                 +                  +                 +                 |   
+  -4 +------------------------------------------------------------------------------------------+   
+   05:06             05:07             05:08              05:09             05:10             05:11 
+                                                                                                    
diff --git a/t/timefmt-streaming-plot-with-xlen.ref b/t/timefmt-streaming-plot-with-xlen.ref
new file mode 100644
index 0000000..805f73c
--- /dev/null
+++ b/t/timefmt-streaming-plot-with-xlen.ref
@@ -0,0 +1,78 @@
+ -3.96 +----------------------------------------------------------------------------------------+   
+       |              +              +              +             +              +              |   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+ -3.97 |-+                                                                                    +-|   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+ -3.98 |-+                                                                                    +-|   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+ -3.99 |-+                                                                                    +-|   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+    -4 |-+                                                                                    +-|   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+ -4.01 |-+                                                                                    +-|   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+ -4.02 |-+                                                                                    +-|   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+       |                                                                                        |   
+ -4.03 |-+                                                                                    +-|   
+       |                                                                                        |   
+       |                                                                                        |   
+       |              +              +              +             +              +              |   
+ -4.04 +----------------------------------------------------------------------------------------+   
+     05:03          05:03          05:04          05:04         05:05          05:05          05:06 
+                                                                                                    
+  2 +-------------------------------------------------------------------------------------------+   
+    |              +               +              +              +               +       *****  |   
+    |                                                                               *****       |   
+    |                                                                         ******            |   
+    |                                                                    *****                  |   
+    |                                                               *****                       |   
+  1 |-+                                                         *A**                          +-|   
+    |                                                         **                                |   
+    |                                                       **                                  |   
+    |                                                     **                                    |   
+    |                                                   **                                      |   
+    |                                                 **                                        |   
+  0 |-+                                             **                                        +-|   
+    |                                             **                                            |   
+    |                                           **                                              |   
+    |                                         **                                                |   
+    |                                       **                                                  |   
+    |                                     **                                                    |   
+ -1 |-+                                 **                                                    +-|   
+    |                                 **                                                        |   
+    |                               **                                                          |   
+    |                             **                                                            |   
+    |                           **                                                              |   
+    |                         **                                                                |   
+ -2 |-+                     **                                                                +-|   
+    |                     **                                                                    |   
+    |                   **                                                                      |   
+    |                 **                                                                        |   
+    |               **                                                                          |   
+    |             **                                                                            |   
+ -3 |-+         **                                                                            +-|   
+    |         **                                                                                |   
+    |       **                                                                                  |   
+    |     **                                                                                    |   
+    |   **                                                                                      |   
+    | **           +               +              +              +               +              |   
+ -4 +-------------------------------------------------------------------------------------------+   
+  05:06          05:06           05:07          05:07          05:08           05:08          05:09 
+                                                                                                    
diff --git a/t/timefmt-with-custom-rangesize.ref b/t/timefmt-with-custom-rangesize.ref
new file mode 100644
index 0000000..4a00dae
--- /dev/null
+++ b/t/timefmt-with-custom-rangesize.ref
@@ -0,0 +1,39 @@
+  5.5 +-----------------------------------------------------------------------------------------+   
+      |          +           +          +          +          +           +          +          |   
+      |                                                                                         |   
+      |                                                                                         |   
+    5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+  4.5 |-+                                                                                     +*|   
+      |                                                                  ***                    |   
+      |                                                                   *                     |   
+      |                                                                   *                     |   
+    4 |-+                                                                 A                   +-|   
+      |                                                                   *                     |   
+      |                                                                   *                     |   
+  3.5 |-+                                                                ***                  +-|   
+      |                                                                                         |   
+      |                                           ***                                           |   
+      |                                            *                                            |   
+    3 |-+                                          A                                          +-|   
+      |                                            *                                            |   
+      |                                           ***                                           |   
+      |                                                                                         |   
+  2.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                     ***                                                                 |   
+    2 |-+                    A                                                                +-|   
+      |                      *                                                                  |   
+      |                     ***                                                                 |   
+      |                                                                                         |   
+  1.5 |-+                                                                                     +-|   
+      |                                                                                         |   
+      |                                                                                         |   
+    1 |*+                                                                                     +-|   
+      |*                                                                                        |   
+      |                                                                                         |   
+      |          +           +          +          +          +           +          +          |   
+  0.5 +-----------------------------------------------------------------------------------------+   
+    05:08      05:08       05:09      05:09      05:10      05:10       05:11      05:11      05:12 
+                                                                                                    
diff --git a/t/timefmt-with-vnl-with-style.ref b/t/timefmt-with-vnl-with-style.ref
new file mode 100644
index 0000000..5d74266
--- /dev/null
+++ b/t/timefmt-with-vnl-with-style.ref
@@ -0,0 +1,39 @@
+  10 +------------------------------------------------------------------------------------------+   
+     |         +         +        =+  =      +          +         +         +         +       ==|   
+     |                           =     =                                                     =  |   
+     |                           =      ==                                                  =   |   
+     |                          =         =                                               ==    |   
+     |                         =           ==                                            =      |   
+     |                        =              =                                          =       |   
+   9 |-+                     =                =                                       ==      +-|   
+     |                      =                  ==                                    =        @@|   
+     |                      =                    =                                  =        @  |   
+     |                     =                      ==                              ==        @   |   
+     |                    =                         =                            =        @@    |   
+     |                   =                           ==                        ==        @      |   
+     |                  =                              =                      =         @       |   
+   8 |-+               =                                =                    =        @@      +-|   
+     |                 =                                 ==                ==        @          |   
+     |                =                                    =              =         @           |   
+     |               =                                      ==           =        @@            |   
+     |              =                                         =        ==        @              |   
+     |             =                                           =      =        @@               |   
+     |            =                                             ==   =        @                 |   
+     |            =                                                ==        @                  |   
+   7 |-+         =                                                =        @@                 +-|   
+     |          =                                                         @                     |   
+     |         =                                                         @                      |   
+     |        =                                                        @@                       |   
+     |       =                                                        @                         |   
+     |       =                                                       @                          |   
+     |      =                                                      @@                           |   
+   6 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@                           +-|   
+     |    =                                                                                     |   
+     |   =                                                                                      |   
+     |  =                                                                                       |   
+     |  =                                                                                       |   
+     | =                                                                                        |   
+     |=        +         +         +         +          +         +         +         +         |   
+   5 +------------------------------------------------------------------------------------------+   
+   01:00     01:10     01:20     01:30     01:40      01:50     02:00     02:10     02:20     02:30 
+                                                                                                    
diff --git a/t/timefmt-with-vnl-with-style0-default1.ref b/t/timefmt-with-vnl-with-style0-default1.ref
new file mode 100644
index 0000000..e8ceaa2
--- /dev/null
+++ b/t/timefmt-with-vnl-with-style0-default1.ref
@@ -0,0 +1,39 @@
+  10 +------------------------------------------------------------------------------------------+   
+     |         +         +        =+  =      +          +         +         +         +       ==|   
+     |                           =     =                                                     =  |   
+     |                           =      ==                                                  =   |   
+     |                          =         =                                               ==    |   
+     |                         =           ==                                            =      |   
+     |                        =              =                                          =       |   
+   9 |-+                     =                =                                       ==      +-|   
+     |                      =                  ==                                    =          |   
+     |                      =                    =                                  =           |   
+     |                     =                      ==                              ==            |   
+     |                    =                         =                            =              |   
+     |                   =                           ==                        ==               |   
+     |                  =                              =                      =                 |   
+   8 |-+               =                                =                    =                +-|   
+     |                 =                                 ==                ==                   |   
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+     |               =                                      ==           =                      |   
+     |              =                                         =        ==                       |   
+     |             =                                           =      =                         |   
+     |            =                                             ==   =                          |   
+     |            =                                                ==                           |   
+   7 |-+         =                                                =                           +-|   
+     |          =                                                                               |   
+     |         =                                                                                |   
+     |        =                                                                                 |   
+     |       =                                                                                  |   
+     |       =                                                                                  |   
+     |      =                                                                                   |   
+   6 |-+   =                       B                              B                           +-|   
+     |    =                                                                                     |   
+     |   =                                                                                      |   
+     |  =                                                                                       |   
+     |  =                                                                                       |   
+     | =                                                                                        |   
+     |=        +         +         +         +          +         +         +         +         |   
+   5 +------------------------------------------------------------------------------------------+   
+   01:00     01:10     01:20     01:30     01:40      01:50     02:00     02:10     02:20     02:30 
+                                                                                                    
diff --git a/t/timefmt-without-vnl-with-style.ref b/t/timefmt-without-vnl-with-style.ref
new file mode 100644
index 0000000..5d74266
--- /dev/null
+++ b/t/timefmt-without-vnl-with-style.ref
@@ -0,0 +1,39 @@
+  10 +------------------------------------------------------------------------------------------+   
+     |         +         +        =+  =      +          +         +         +         +       ==|   
+     |                           =     =                                                     =  |   
+     |                           =      ==                                                  =   |   
+     |                          =         =                                               ==    |   
+     |                         =           ==                                            =      |   
+     |                        =              =                                          =       |   
+   9 |-+                     =                =                                       ==      +-|   
+     |                      =                  ==                                    =        @@|   
+     |                      =                    =                                  =        @  |   
+     |                     =                      ==                              ==        @   |   
+     |                    =                         =                            =        @@    |   
+     |                   =                           ==                        ==        @      |   
+     |                  =                              =                      =         @       |   
+   8 |-+               =                                =                    =        @@      +-|   
+     |                 =                                 ==                ==        @          |   
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+     |               =                                      ==           =        @@            |   
+     |              =                                         =        ==        @              |   
+     |             =                                           =      =        @@               |   
+     |            =                                             ==   =        @                 |   
+     |            =                                                ==        @                  |   
+   7 |-+         =                                                =        @@                 +-|   
+     |          =                                                         @                     |   
+     |         =                                                         @                      |   
+     |        =                                                        @@                       |   
+     |       =                                                        @                         |   
+     |       =                                                       @                          |   
+     |      =                                                      @@                           |   
+   6 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@                           +-|   
+     |    =                                                                                     |   
+     |   =                                                                                      |   
+     |  =                                                                                       |   
+     |  =                                                                                       |   
+     | =                                                                                        |   
+     |=        +         +         +         +          +         +         +         +         |   
+   5 +------------------------------------------------------------------------------------------+   
+   01:00     01:10     01:20     01:30     01:40      01:50     02:00     02:10     02:20     02:30 
+                                                                                                    
diff --git a/t/timefmt-without-vnl-with-style0-default1.ref b/t/timefmt-without-vnl-with-style0-default1.ref
new file mode 100644
index 0000000..e8ceaa2
--- /dev/null
+++ b/t/timefmt-without-vnl-with-style0-default1.ref
@@ -0,0 +1,39 @@
+  10 +------------------------------------------------------------------------------------------+   
+     |         +         +        =+  =      +          +         +         +         +       ==|   
+     |                           =     =                                                     =  |   
+     |                           =      ==                                                  =   |   
+     |                          =         =                                               ==    |   
+     |                         =           ==                                            =      |   
+     |                        =              =                                          =       |   
+   9 |-+                     =                =                                       ==      +-|   
+     |                      =                  ==                                    =          |   
+     |                      =                    =                                  =           |   
+     |                     =                      ==                              ==            |   
+     |                    =                         =                            =              |   
+     |                   =                           ==                        ==               |   
+     |                  =                              =                      =                 |   
+   8 |-+               =                                =                    =                +-|   
+     |                 =                                 ==                ==                   |   
+     |                =                                    =              =                     |   
+     |               =                                      ==           =                      |   
+     |              =                                         =        ==                       |   
+     |             =                                           =      =                         |   
+     |            =                                             ==   =                          |   
+     |            =                                                ==                           |   
+   7 |-+         =                                                =                           +-|   
+     |          =                                                                               |   
+     |         =                                                                                |   
+     |        =                                                                                 |   
+     |       =                                                                                  |   
+     |       =                                                                                  |   
+     |      =                                                                                   |   
+   6 |-+   =                       B                              B                           +-|   
+     |    =                                                                                     |   
+     |   =                                                                                      |   
+     |  =                                                                                       |   
+     |  =                                                                                       |   
+     | =                                                                                        |   
+     |=        +         +         +         +          +         +         +         +         |   
+   5 +------------------------------------------------------------------------------------------+   
+   01:00     01:10     01:20     01:30     01:40      01:50     02:00     02:10     02:20     02:30 
+                                                                                                    
diff --git a/t/timefmt-without-vnl.ref b/t/timefmt-without-vnl.ref
new file mode 100644
index 0000000..74b2798
--- /dev/null
+++ b/t/timefmt-without-vnl.ref
@@ -0,0 +1,39 @@
+  10 +------------------------------------------------------------------------------------------+   
+     |         +         +        *+  *      +          +         +         +         +       **|   
+     |                           *     *                                                     *  |   
+     |                           *      **                                                  *   |   
+     |                          *         *                                               **    |   
+     |                         *           **                                            *      |   
+     |                        *              *                                          *       |   
+   9 |-+                     *                *                                       **      +-|   
+     |                      *                  **                                    *        ##|   
+     |                      *                    *                                  *        #  |   
+     |                     *                      **                              **        #   |   
+     |                    *                         *                            *        ##    |   
+     |                   *                           **                        **        #      |   
+     |                  *                              *                      *         #       |   
+   8 |-+               *                                *                    *        ##      +-|   
+     |                 *                                 **                **        #          |   
+     |                *                                    *              *         #           |   
+     |               *                                      **           *        ##            |   
+     |              *                                         *        **        #              |   
+     |             *                                           *      *        ##               |   
+     |            *                                             **   *        #                 |   
+     |            *                                                **        #                  |   
+   7 |-+         *                                                A        ##                 +-|   
+     |          *                                                         #                     |   
+     |         *                                                         #                      |   
+     |        *                                                        ##                       |   
+     |       *                                                        #                         |   
+     |       *                                                       #                          |   
+     |      *                                                      ##                           |   
+   6 |#############################B##############################B                           +-|   
+     |    *                                                                                     |   
+     |   *                                                                                      |   
+     |  *                                                                                       |   
+     |  *                                                                                       |   
+     | *                                                                                        |   
+     |*        +         +         +         +          +         +         +         +         |   
+   5 +------------------------------------------------------------------------------------------+   
+   01:00     01:10     01:20     01:30     01:40      01:50     02:00     02:10     02:20     02:30 
+                                                                                                    
diff --git a/t/xticlabels-clustered.ref b/t/xticlabels-clustered.ref
new file mode 100644
index 0000000..32abfc3
--- /dev/null
+++ b/t/xticlabels-clustered.ref
@@ -0,0 +1,39 @@
+  5 +-------------------------------------------------------------------------------------------+   
+    |                 +                  +             *   *                  +                 |   
+    |                                                  *   *                                    |   
+    |                                                  *   *                                    |   
+    |                                                  *   *                                    |   
+    |                                                  *   *                                    |   
+    |                                                  *   *                                    |   
+  4 |-+                                                *   ######                             +-|   
+    |                                                  *   #    #                               |   
+    |                                                  *   #    #                               |   
+    |                                                  *   #    #                               |   
+    |                                                  *   #    #                               |   
+    |                                                  *   #    #                               |   
+    |                                                  *   #    #                               |   
+  3 |-+                             ******             *   #    #                             +-|   
+    |                               *    *             *   #    #                               |   
+    |                               *    *             *   #    #                               |   
+    |                               *    *             *   #    #                               |   
+    |                               *    *             *   #    #                               |   
+    |                               *    *             *   #    #                               |   
+    |                               *    *             *   #    #                               |   
+    |                               *    *             *   #    #                               |   
+  2 |-+           *****             *    #####         *   #    #        ******               +-|   
+    |             *   *             *    #   #         *   #    #        *    *                 |   
+    |             *   *             *    #   #         *   #    #        *    *                 |   
+    |             *   *             *    #   #         *   #    #        *    *                 |   
+    |             *   *             *    #   #         *   #    #        *    *                 |   
+    |             *   *             *    #   #         *   #    #        *    *                 |   
+    |             *   *             *    #   #         *   #    #        *    *                 |   
+  1 |-+           *   ######        *    #   #         *   #    #        *    #####           +-|   
+    |             *   #    #        *    #   #         *   #    #        *    #   #             |   
+    |             *   #    #        *    #   #         *   #    #        *    #   #             |   
+    |             *   #    #        *    #   #         *   #    #        *    #   #             |   
+    |             *   #    #        *    #   #         *   #    #        *    #   #             |   
+    |             *   #    #        *    #   #         *   #    #        *    #   #             |   
+    |             *   #    #        *    #   #         *   #    #        *    #   #             |   
+  0 +-------------------------------------------------------------------------------------------+   
+                     aaa                bbb               ccc                ddd                    
+                                                                                                    
diff --git a/t/xticlabels-styles-with-tuplesize.ref b/t/xticlabels-styles-with-tuplesize.ref
new file mode 100644
index 0000000..ea7b3eb
--- /dev/null
+++ b/t/xticlabels-styles-with-tuplesize.ref
@@ -0,0 +1,39 @@
+  6 +-------------------------------------------------------------------------------------------+   
+    |      +            +                                                   +            +      |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+  5 |-+                                                                   **D                 +-|   
+    |                                                                 ****   *                  |   
+    |                                                             ****       *                  |   
+    |                                                        *****            *                 |   
+    |                                                    ****                  *                |   
+    |                                                ****                       *               |   
+  4 |-+                                         *****                           *             +-|   
+    |                                       ****                                 *              |   
+    |                                   ****                                      *             |   
+    |                              *****                                           *            |   
+    |                          ****                                                *            |   
+    |                      ****                                                     *           |   
+  3 |-+                *B**                                                          *        +-|   
+    |                **                                                              *          |   
+    |              **                                                                 *         |   
+    |            **                                                                    *        |   
+    |          **                                                                       *       |   
+    |        **                                                                         *       |   
+  2 |-+    A*                                                                            A    +-|   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+  1 |-+                                                                                       +-|   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |      +            +                                                   +            +      |   
+  0 +-------------------------------------------------------------------------------------------+   
+          aaa          bbb                                                 ccc          ddd         
+                                                                                                    
diff --git a/t/xticlabels-styles.ref b/t/xticlabels-styles.ref
new file mode 100644
index 0000000..50af2b5
--- /dev/null
+++ b/t/xticlabels-styles.ref
@@ -0,0 +1,39 @@
+  6 +-------------------------------------------------------------------------------------------+   
+    |      +            +                                                   +            +      |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+  5 |-+                                                                     A                 +-|   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+  4 |-+                                                                   ###                 +-|   
+    |                                                                 ####   #                  |   
+    |                                                             ####       #                  |   
+    |                                                        #####            #                 |   
+    |                                                    ####                  #                |   
+    |                                                ####                       #               |   
+  3 |-+                 A                       #####                           #             +-|   
+    |                                       ####                                 #              |   
+    |                                   ####                                      #             |   
+    |                              #####                                           #            |   
+    |                          ####                                                #            |   
+    |                      ####                                                     #           |   
+  2 |-+    A           ####                                                          #   A    +-|   
+    |                ##                                                              #          |   
+    |              ##                                                                 #         |   
+    |            ##                                                                    #        |   
+    |          ##                                                                       #       |   
+    |        ##                                                                         #       |   
+  1 |-+    ##                                                                            #    +-|   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |                                                                                           |   
+    |      +            +                                                   +            +      |   
+  0 +-------------------------------------------------------------------------------------------+   
+          aaa          bbb                                                 ccc          ddd         
+