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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%%
+%% Copyright (C) 2010 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[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{118.324pt}
+\setlength\parindent{0pt}
+\StartShownPreambleCommands
+\usepackage{pst-plot}
+\StopShownPreambleCommands
+\begin{document}
+\psset{unit=1.5}
+\begin{pspicture}[showgrid](-1.2,-1.2)(1.2,1.2)
+ \psset{plotpoints=200,linewidth=1.5pt,algebraic}
+ \def\PSfunc{ (t^2-1)*param/(t^2+1) | (t^2-1)*t*param/(t^2+1) }
+ \psparametricplot{-1.85}{1.85}[/param 1 def]{\PSfunc}
+ \psparametricplot[linestyle=dashed]%
+ {-4.5}{4.5}[/param 0.25 def]{\PSfunc}
+ \psparametricplot[linestyle=dotted]%
+ {-2.1}{2.1}[/param 0.75 def]{\PSfunc}
+ \rput[l](-0.95,-0.4){$a=1;\ 0.75;\ 0.25$}
+\end{pspicture}
+\end{document}