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+%%
+%% A DANTE-Edition example
+%%
+%% Example 15-03-5 on page 207.
+%%
+%% 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{153.70511pt}
+\setlength\parindent{0pt}
+\AtBeginDocument{%
+ \psset{mathLabel=false,labelFontSize=\small}}
+
+\usepackage{pst-plot}
+
+\begin{document}
+\psset{unit=1.5}
+\begin{pspicture}[showgrid](-1.2,-1.2)(1.2,1.2)
+ \psset{plotpoints=200,linewidth=1.5pt}
+ \def\PSfunc{t t mul 1 sub \param\space mul
+ t t mul 1 add div t t mul 1 sub t mul
+ \param\space mul t t mul 1 add div}
+ \def\param{1}\parametricplot{-1.85}{1.85}{\PSfunc}
+ \def\param{0.25}\parametricplot[linestyle=dashed]%
+ {-4.5}{4.5}{\PSfunc}
+ \def\param{0.75}\parametricplot[linestyle=dotted]%
+ {-2.1}{2.1}{\PSfunc}
+ \rput[l](-0.95,-0.4){$a=1;\ 0.75;\ 0.25$}
+\end{pspicture}
+\end{document}