25 setxunit
-4 4 setxrange
-4 6 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
%marks
traceaxes
axesarrow
/f {setxvar
x 3 exp 3 div x add 0.5 sub
} def
/g {setxvar
x 3 exp 3 div x add 1 add
} def
/ff {setxvar
x 3 exp 3 div x add 2 add
} def
/gg {setxvar
x 3 exp 3 div x add 4 add
} def
gsave
noir
1.75 setlinewidth
continu
{f} courbe
grestore
gsave
noir
1.75 setlinewidth
continu
{g} courbe
grestore
gsave
noir
1.75 setlinewidth
continu
{ff} courbe
grestore
gsave
noir
1.75 setlinewidth
continu
{gg} courbe
grestore
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