%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 5-7-13 on page 246.
%% 
%%  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{159.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](4,4)
  \psecurve[showpoints=true,
     linewidth=1.5pt](.125,6)(.25,4)(1,3.5)%
     (1,1)(2,3)(4,.25)(8,.125)
  \pscurve[linecolor=blue,linewidth=0.5pt,
     linestyle=dashed](.25,4)(1,3.5)(1,1)(2,3)(4,.25)
\end{pspicture}
\end{document}