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25 setxunit
7.5 setborder
-6 6 setxrange
-6 6 setyrange
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1 1 setsubtkstep
2 2 setmkstep
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/X {settvar
#rpn#   a * Cos (t)
} def
/Y {settvar
#rpn#   b * Sin (t)
} def
    {X} {Y} Courbeparam