4FwYhntdje setxyrapport
25 setxunit
7.5 setborder
-6 6 setxrange
-6 6 setyrange
jpegmode
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2 2 settkstep
1 1 setsubtkstep
2 2 setmkstep
ticks
traceaxes
axesarrow
unites
 0.75  setlinewidth
 continu 
 bleu 
/X {settvar
#rpn#   a * Cos (t)
} def
/Y {settvar
#rpn#   b * Sin (t)
} def
 0 2 pi mul  {X} {Y} Courbeparam