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%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-6-22 on page 412.
%% 
%%  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{207.83385pt}
\newcommand\func{ x 3 exp x y 4 exp mul add x 5 div sub 10 mul
  2.729 x dup mul y dup mul add neg exp mul
  2.729 x 1.225 sub dup mul y dup mul add neg exp add }
\StartShownPreambleCommands
\usepackage{graphicx,pstricks,pst-3dplot}
% \func as defined in Example 6-6-13
\StopShownPreambleCommands
\begin{document}
\psset{unit=0.7}
\makebox[\linewidth]{%
\begin{pspicture}(-4,-3)(4,4)  \psset{Alpha=45,Beta=15}
  \psplotThreeD[plotstyle=curve,yPlotpoints=10,xPlotpoints=10,
    linewidth=0.5pt,hiddenLine=true](-3,3)(-3,3){\func}
  \pstThreeDCoor[xMax=5,yMax=5,zMax=3.5]
\end{pspicture}
\begin{pspicture}(-4,-3)(4,4)  \psset{Alpha=45,Beta=15}
  \psplotThreeD[plotstyle=curve,yPlotpoints=20,xPlotpoints=50,
     linewidth=0.5pt,hiddenLine=true](-3,3)(-3,3){\func}
  \pstThreeDCoor[xMax=5,yMax=5,zMax=3.5]
\end{pspicture}}
\end{document}