250 setwidth
250 setheight
7.5 setborder
-1.1 1.1 setxrange
-1.1 1.1 setyrange
jpegmode
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
/X {settvar
    2 t mul Sin
} def
/Y {settvar
    3 t mul Sin
} def
  0  2 pi mul settrange
gsave
   1.75 setcurvelinewidth
   continu
   bleu
   {X} {Y} courbeparam
grestore