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Written on June 24, 2019
% Dans le préambule
% -----------------
\usepackage{pstricks-add}
% -----------------
\begin{pspicture}(-1,0)(2,2)
\psgrid[subgriddiv=4,subgridcolor=lightgray,
gridlabels=6pt,gridcolor=gray](-1,0)(2,2)
\end{pspicture}