\def\dessin#1#2{
\begin{figure}
\begin{center}
\setlength{\unitlength}{1cm}
\fbox{\begin{picture}(15.00,5.00)
\special{psfile=\Figdir d7.12.ps}
\end{picture}}
\end{center}
\caption{\label{#2}#1}
\end{figure}}