using color

• https://bottosson.github.io/posts/colorwrong/
• https://bottosson.github.io/misc/colorpicker/
• https://cran.r-project.org/web/packages/viridis/vignettes/intro-to-viridis.html
• https://colorbrewer2.org/
• stackoverflow guy cooks on diverging maps
• matplotlib docs colormap explanation

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