%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 5-4-1 on page 224.
%% 
%%  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}
\begin{pspicture}(-1,-1)(2,2)
  \psaxes{->}(0,0)(-1,-1)(2,2)
  \psset{linewidth=1.5pt}
  \parabola(1,2)(-0.5,-0.5)
  \parabola[origin={0.25,-0.5},
    linestyle=dashed](1,2)(-0.5,-0.5)
  \qdisk(-0.5, 0){2pt}
\end{pspicture}
\end{document}