-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
$u$
2.05 0 [1.4 dup] dltexlabel
$v$
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