Viridis is a great palette to use because it shows contrast between low and high values very well, and is color-blind friendly. Below, I've written code that can be copy and pasted into R to change the color palette of your visualization to Viridis: c(" #440154 ", " #414487 ", " #2A788E ", " #22A884 ", " #7ad151 "," #fde725 ") Here's how to add the viridis color palette to R using scale_fill_gradientn: scale_fill_gradientn(colors = c("#440154", "#414487", "#2A788E", "#22A884"