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I know that by setting alpha to for example col = rgb(0, 0, 0, 0.1) it is possible to see how many overlapping is in the plot. But disadvantage of it is that single points are barely visible on the background. So I wonder if there is possible to make setting that single points would be almost black, but with more and more data on the same spot it would get more and more whiteish. Or maybe it is

...SE) # here is the solution - plot the same data with low alpha and different color blue is best because is perceived as darkest points(x,y,col = rgb(0,0,1,0.1),pch='.') abline(h=0, lty=3, col="green") abline(v=0, lty=3, col="green") par <- op http://i51.tinypic.com/maxmcl.png [[repost, because subject was deleted and this message won't get into the list]] -- View this message in context: http://r.789695.n4.nabble.com/negative-alpha-or-custom-gradient-colors-of-da ta-dots-in-scatterplot-tp3052394p3054465.html Sent from the R help mailing list archive at Nabble...