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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 5-13-14 on page 286.
%%
%% 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}
\SpecialCoor
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](3,3)
\pstVerb{/rad {180.0 mul 2 div} def}
\pscustom[plotpoints=200]{%
\psplot{0}{3}{x rad sin 1.5 add}
\gsave
\psline(! 3 dup rad sin 1.5 add)%
(!3 dup rad sin neg 1.5 add)
\psplot{3}{0}{x rad sin neg 1.5 add}
\fill[fillcolor=lightgray,fillstyle=solid]
\grestore
\psplot[liftpen=2]{3}{0}{x rad sin neg 1.5 add} }
\end{pspicture}
\end{document}
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