25 setxunit
7.5 setborder
90 setangle_repere
0 10 setxrange
0 8 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
/f {setxvar
#rpn# 2.5-x
} def
gsave
bleu
.75 setlinewidth
continu
{f} courbe
grestore
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