-1.6 2.1 setxrange
-1.6 2 setyrange
60 setxunit
90 setangle_repere

traceaxes
axesarrow
 
/O{0 0} def
/cerc{O 1} def
cerc cercle

/X {45 cerc cpoint} def
/Y {120 cerc cpoint} def
/Z {240 cerc cpoint} def
/T {315 cerc cpoint} def


gsave
pointilles
[-0.5 -1.5 -0.5 1.5] ligne
[0.70711 -1.5 0.70711 1.5] ligne
grestore

<latex>
$u$
</latex>
2.05 0 [1.4 dup] dltexlabel

<latex>
$v$
</latex>
0 1.9 [1.4 dup] crtexlabel


[-0.5 0 0.70711 0] points

gsave
4.2 setlinewidth
45 120 cerc Cercle
240 315 cerc Cercle
grestore


/dotscale {2.0 dup} def
gsave
[X Y Z T] {point} plot
grestore