I have yet one problem, though -- with making the shapes solid.

Neither "solid circle" nor "filled circle" works:

points(sandwich3,cex=sandwich3$p*3,ph=19,col="gray")
points(sandwich3,cex=sandwich3$p*3,ph=21,col="gray",bg="gray")

​although "solid circle" works in the legend.

Cheers,
Artur

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