25 setxunit
7.5 setborder
-10 10 setxrange
-10 10 setyrange
jpegmode
/k 8 def
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
1.75 setlinewidth
continu
bleu
/X {settvar
2 t Cos mul 4 t mul Cos sub
} def
/Y {settvar
1 t Sin mul 4 t mul Sin sub
} def
0 2 pi mul {X} {Y} Courbeparam
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