[R] Advanced graphics for points

[Strongbad78]

Hi all,
For aestethic purposes, I would like to plot points on an xy plot that
consist of a filled circle with a black outline.
I can sort of bodge it by plotting pch=21, col="black" and pch=16, col="red"
on the same plot, but it looks a bit ugly and there are problems when points
overlap.
Can anyone think of a way around this?
Thanks in advance
Tony
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