Increase resolution of color scale for values close to zero

Question

I\'d like to make small returns in this plot more visible. The most appropriate function seems to be scale_colour_gradient2, but this washes out the small retur

Answer 1

how about:

p + scale_colour_gradient2(low="blue",high="red",mid="purple")

or

p + scale_colour_gradient2(low="blue",high="red",mid="darkgrey")