200 setxunit
7.5 setborder
90 setangle_repere
-1 1 setxrange
-1 1 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
/X {settvar
    t Sin 6 t mul Cos mul
} def
/Y {settvar
    t Cos 3 t mul Sin mul
} def
400 setresolution
gsave
   1.75 setlinewidth
   continu
   bleu
  0  2 pi mul {X} {Y} Courbeparam
grestore