Jason Rupert wrote: > ... > > Also, do you know how to make the radial rings "black" and a little > thicker? A co-worker requested that the be made a little darker and > easier to see. > Hi Jason, You can make the radial grid black with grid.col="black", but unfortunately there is no option for a thicker grid. You could add lwd=2 to line 170 if you just want a one-off. Jim