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+The package allows the user to use the computer algebra system XCAS
+to generate tables of signs and of variations (the actual plotting of
+the tables uses the MetaPost macro package "tableauVariation.mp" :
+
+http://frederic.mazoit.free.fr/LaTeX_metapost/tableauVariations/ .
+
+The tablor package requires that shell escape be enabled.
+
+
+For instance :
+
+\begin{TV} TV([-10,+infinity],[-1,1],"g","t",x^2/(x^2-1),1,n,\tv) \end{TV}
+
+draws table of variations of x->x^2/(x^2-1).
+
+
+You can download XCAS here:
+
+
+http://www-fourier.ujf-grenoble.fr/%7Eparisse/giac.html
+
+
+The non-french users need to comment out every
+
+" \usepackage[upright]{fourier} "
+
+Just put tablor.sty and tablor.cfg into /texmf/tex/latex/tablor/