%@AUTEUR:Guillaume Connan

prologues:=2;

verbatimtex
%&latex
\documentclass{article}
\usepackage[upright]{fourier}
\begin{document}
etex

input geometriesyr16

figure(-10cm,-5cm,12cm,10cm); 
drawarrow origin--(5cm,1cm);
label.bot(btex $\overrightarrow{u}$ etex, (2.5cm,.5cm));
drawarrow (5cm,2cm)--(0,1cm) withcolor 0.4white withpen pencircle scaled 1.8bp;
label.top(btex $-\overrightarrow{u}$ etex, (2.5cm,1.5cm)) withcolor 0.4white withpen pencircle scaled 1.8bp;
fin;

end