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%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 5-12-16 on page 276.
%% 
%%  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{183.83385pt}
\AtBeginDocument{%
\renewcommand*\pshlabel[1]{\small#1}
\renewcommand*\psvlabel[1]{\small#1}}
\StartShownPreambleCommands
\usepackage{pstricks}
\usepackage{pst-plot}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-2,-0.5)(2,5.5)
 \begin{psclip}{%
  \pscustom[linestyle=none]{%
    \psplot{-2}{2}{x dup mul 1 add}}
  \pscustom[linestyle=none]{%
    \psplot{2}{-2}{x dup mul neg 5 add}}}
  \psframe*[linecolor=lightgray](-2,0)(2,5)
 \end{psclip}% <- % is important here
 \psaxes{->}(0,0)(-2,-0.5)(2,5.5)
 \psplot{-2}{2}{x dup mul 1 add}
 \psplot{2}{-2}{x dup mul neg 5 add}
 \uput[-90](2,0){x} \uput[0](0,5.5){y}
\end{pspicture}
\end{document}