25 setxunit
7.5 setborder
90 setangle_repere
-2 5 setxrange
-3 5 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
1.75 setlinewidth
continu
bleu
/X {settvar
    2 t 3 exp mul 3 t 2 exp mul add
} def
/Y {settvar
    3 t 4 exp mul 4 t 3 exp mul add
} def
  3 neg  3 {X} {Y} Courbeparam