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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 6-1-41 on page 332.
%%
%% Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss
%%
%% 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.
%%
\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-plot}
\StopShownPreambleCommands
\begin{document}
\psset{unit=2.0}
\newcommand\PSfunction[1]{t t mul 1 sub #1 mul t t mul 1 add div
t t mul 1 sub t mul #1 mul t t mul 1 add div}
\begin{pspicture}(-1.1,-1.1)(1.1,1.1)
\psgrid[subgriddiv=0,griddots=10,gridlabels=7pt]
\psset{plotpoints=200,linewidth=1.5pt}
\parametricplot{-1.85}{1.85}{\PSfunction{1}}
\psset{linestyle=dashed}
\parametricplot{-4.5}{4.5}{\PSfunction{0.25}}
\parametricplot{-2.1}{2.1}{\PSfunction{0.75}}
\rput[r](-0.05,-0.5){$a=1;\ 0.75;\ 0.25$}
\end{pspicture}
\end{document}
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