xPbrd4RcZ setxyrapport
25 setxunit
7.5 setborder
-5 5 setxrange
-5 5 setyrange
jpegmode
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1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
/R {settvar
#rpn#   a  * Sin (k*t)
} def
 0 2 pi mul  settrange
gsave
    0.75  setlinewidth
    continu 
    bleu 
   (R) courbepolar
grestore