People, please don't show a continuous variable with a rainbow gradient. Two colors will do - red/green, green/black, red/blue. Too many colors and you lose re

People, please don't show a continuous variable with a rainbow gradient. Two colors will do - red/green, green/black, red/blue. Too many colors and you lose reference. You see green and have to think about what part of the distribution it maps to; this defeats the whole purpose. Rainbows are pretty, but not the best choice.