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+%%
+%% A DANTE-Edition example
+%%
+%%
+%% 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-solides3d}
+
+\begin{document}
+\psset{lightsrc=30 30 25,viewpoint=50 40 20 rtp2xyz,Decran=20}
+\begin{pspicture}(-6,-8)(7,8)
+\psSurface[ngrid=.25 .25,inouthue=1 0 0.5 1,linewidth=0.01,axesboxed,algebraic]%
+ (-4,-4)(4,4){ ((y^2)-(x^2))/4 }
+\end{pspicture}
+\end{document}