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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 6-6-13 on page 407.
%%
%% 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{222.234pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-3dplot}
\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 }
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-6,-3)(6,4)
\psset{Alpha=45,Beta=15,unit=0.75}
\psplotThreeD[plotstyle=curve,
yPlotpoints=50,xPlotpoints=80,
linewidth=0.5pt](-4,4)(-4,4){\func}
\pstThreeDCoor[xMin=-1,xMax=5,yMin=-1,
yMax=5,zMin=-1,zMax=3.5]
\end{pspicture}
\end{document}
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