"contMap" or "densityMap""contMap" or "densityMap".
setMap(x, ...)"contMap" or "densityMap".colorRampPalette. Also, the argument invert which (if invert=TRUE) will just flip the current color ramp."contMap" or "densityMap".
Revell, L. J. 2013. Two new graphical methods for mapping trait evolution on phylogenies. Methods in Ecology and Evolution, 4, 754-759.
contMap, densityMap