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+%%
+%% A DANTE-Edition example
+%%
+%%
+%% Copyright (C) 2011 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+\documentclass[]{article}
+\pagestyle{empty}
+\setlength\textwidth{201.70511pt}
+\setlength\parindent{0pt}
+
+\usepackage{pstricks-add}
+
+\begin{document}
+\psset{unit=2cm}
+\begin{pspicture}(-2.5,-1.5)(2.5,2.5)
+ \psaxes{->}(0,0)(-2.5,-1.5)(2.5,2.5)
+ \psplot[linewidth=1.5pt,algebraic]{-2.5}{+2.5}{(2*x+4)/(2+x^2)}
+ \psline[linestyle=dashed](-1.5,-1.5)(2.5,2.5)
+ \def\function{ xVal dup add 4 add xVal dup mul 2 add div }%
+ \pstVerb{ /xVal -1 def }% start value
+ \multido{\nA=0+1}{10}{%
+ \psline[linestyle=dotted](! xVal 0 )(! xVal xVal)
+ \psline[linecolor=red](! xVal xVal )(! xVal \function )
+ \psline[linecolor=red](! xVal \function )(! \function\space dup)
+ \pstVerb{ /xVal \function\space def}
+ }
+\end{pspicture}
+\end{document}