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+\documentclass[pstricks]{standalone}
+\usepackage{pst-contourplot}
+\begin{document}
+\begin{pspicture}(-6,-6)(6,6)
+% Courbe du diable
+% page 52 : Revue du Palais de la Découverte
+% Courbes mathématiques
+% Numéro spécial 8 . Juillet 1976
+% et Serge Mehl
+% http://serge.mehl.free.fr/anx/Diable.html
+\psframe*[linecolor=cyan](-6,-6)(6,6)
+\psContourPlot[a=0.1,linecolor=red,Fill,fillcolor=yellow,ReverseColors,
+ function=x 4 exp y 4 exp sub 24 y 2 exp mul add 25 x 2 exp mul sub](-6,-6)(6,6)
+\end{pspicture}
+\end{document} \ No newline at end of file