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%% 
%%  A DANTE-Edition example
%% 
%%  Example 23-05-10 on page 364.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}

\usepackage{pst-3dplot}
\def\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 }

\begin{document}
\psscalebox{0.75}{\begin{pspicture}(-4,-3)(4,4)
  \psset{Alpha=45,Beta=15}
  \psplotThreeD[plotstyle=curve,yPlotpoints=10,xPlotpoints=10,
    linewidth=0.5pt,hiddenLine](-3,3)(-3,3){\func}
  \pstThreeDCoor[xMin=-1,xMax=5,yMin=-1,yMax=5,zMin=-1,zMax=3.5]
\end{pspicture}}\hfill
\psscalebox{0.75}{\begin{pspicture}(-4,-3)(4,4)
  \psset{Alpha=45,Beta=15}
  \psplotThreeD[plotstyle=curve,yPlotpoints=20,xPlotpoints=50,
     linewidth=0.5pt,hiddenLine](-3,3)(-3,3){\func}
  \pstThreeDCoor[xMin=-1,xMax=5,yMin=-1,yMax=5,zMin=-1,zMax=3.5]
\end{pspicture}}
\end{document}