25 setxunit
7.5 setborder
90 setangle_repere
-.5 6 setxrange
-4 8 setyrange
/quadrillagegray 0.4 def
1 setquadrillagexstep
1 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
1 1 setmkstep
ticks
marks
traceaxes
unites