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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}
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