@mattdm No no; what I meant was the "16.0%" etc, which are peculiar values to be specific about, and which are unevenly spaced. (Also, what the top-most & bottom-most numbers are, like is it 0%–16% or is it 12.7%–16%). And the color saturations/brightnesses don't seem to line up to the numbers....
Those are kinda red flags for me; they smack of charts generated by Excel with a bunch of settings left at defaults.
(doesn't mean the source is wrong, tbs; I just get antsy about viz misleadingness)