Hi Dr. Wicklin, I'm a new SAS user. Thank you very much for proving this interesting topic. For your first graph about "life expectancy in low income countries", I wonder how to change the scale from "20 to 60 by 20" to, say, "20 to 60 by 10"? I use SAS 9.4 and use heatmapparm statement in PROC SGPLOT to construct a similar graph (here you use heat map in 9.4), but I have no idea how to change the scale when referring to the heatmapparm manual. I'm really appreciated for your kind help!