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%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 5-7-18 on page 248.
%% 
%%  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{111.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](3,3)
  \pscurve[showpoints=true,linecolor=red,
    linestyle=dashed](0,1)(2,2.5)(3,0)
  \pscurve[linecolor=green,curvature=2 0.1 0](0,1)(2,2.5)(3,0)
  \pscurve[linecolor=blue,curvature=0.0 0.1 0](0,1)(2,2.5)(3,0)
  \pscurve[linecolor=gray,curvature=-0.5 0.1 0](0,1)(2,2.5)(3,0)
  \pscurve[linecolor=black,curvature=-1.0 0.1 0](0,1)(2,2.5)(3,0)
  \uput[-75](0,1){A}\uput[180](3,0){B}\uput[90](2,2.5){C}
\end{pspicture}
\end{document}