Is there a possibility to adjust the coloring of the heatmap according to the range of the values. Eg. matr<-cbind("X1"=c(11,12,14,8,7,9,10,11),"X2"=c(1,3,2,5,7,6,3,2)) heatmap(matr, col = rev(dChip.colors(50)), hclustfun = hclust) The heatmap shows uniformly the colors red for X2 and blue for X1. But is there not a possibility to adjust the range for the colors. To make a long story short, I want a smoother representation. Can anybody help me with this? Thanks