1 setxyrapport
90 setxunit
7.5 setborder
90 setangle_repere
-0.25 5 setxrange
-0.5 7 setyrange
[1 1 .5 .5 .1 .1] {orange} Quadrillage
/quadrillagegray 0.4 def
1 setquadrillagexstep
1 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
1 1 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
/f {setxvar
#rpn#   x+5/x-1
} def
/g {setxvar
#rpn#   4+1/x
} def
gsave
   noir
   .75 setlinewidth
   continu
   {f} courbe
grestore
gsave
   bleu
   .65 setlinewidth
   continu
   {g} courbe
grestore
gsave
   rouge
   continu
   /hstep 2 store
   /hangle 45 store
  1  4 {f} {g} Hachcourbes
grestore