thanks, guys. circles might be a good candidate for a graphics primitive in the next R version,
The 'symbols' function can draw circles, as well as a few other things - stars, squares, rectangles, boxplots and thermometers.
Postscript produced with symbols' circles option does produce true scalable circles, but I don't think you can have true scalable postscript ellipses without some major hacking on R's device driver code!
Baz
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