Yes I noticed that too, and I agree with your guess about why it’s ok. Fundamentally the functions here are smoothly varying, which avoids ambiguities and some

Yes I noticed that too, and I agree with your guess about why it’s ok. Fundamentally the functions here are smoothly varying, which avoids ambiguities and some some contrast effects that affect chloropleth maps. Long path length in colorspace == more opportunities for nearby discrimination, even if with overlapping hues