25 setxunit
7.5 setborder
90 setangle_repere
-2 7 setxrange
-2 7 setyrange
1 1 settkstep
.5 .5 setsubtkstep
1 1 setmkstep
ticks
marks
traceaxes
axesarrow
/f {setxvar
#rpn#   1/x
} def
/g {setxvar
#rpn#   4/x
} def
/h {setxvar
#rpn#  9/x
} def
gsave
   noir
   .75 setlinewidth
   continu
 0.1 7  {f} Courbe
 0.4 7  {g} Courbe
 0.9 7  {h} Courbe
grestore