25 setxunit
7.5 setborder
90 setangle_repere
-2 5 setxrange
-1 6 setyrange
/quadrillagegray 0.4 def
1 setquadrillagexstep
1 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
/f {setxvar
#rpn#   4 + 0.100666666667*x^2 - 0.00988888888889*x^3 - 0.00311111111111*x^4 - 0.00855555555556*x^5
} def
/g {setxvar
#rpn#   -3/4*x^2 + 5*x/2 + 2
} def
gsave
   noir
   1 setlinewidth
   continu
  2 neg  2 {f} Courbe
grestore
gsave
   noir
   .75 setlinewidth
   pointilles
  2  4 {g} Courbe
grestore