Evidently, you can’t have different color aesthetics for two different geoms. As a workaround, use a fill aesthetic for the points instead. This means you have to use a point marker style that has a filled interior (see `?pch`

and scroll down for the available point styles). Here’s a way to do that:

ggplot() + geom_point(data=merged,aes(x = pauseMedian, y = numTotalPauses, fill = diff), pch=21, size=5, colour=NA) + geom_polygon(data = splineHull, mapping=aes(x=pauseMedian, y=numTotalPauses, colour = microstyle), alpha=0)

Adding `colour=NA`

(outside of `aes()`

), gets rid of the default black border around the point markers. If you want a colored border around the points, just change `colour=NA`

to whatever colour you prefer.

Also see this thread from the `ggplot2`

Google group, discussing a similar problem and some workarounds.

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