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Charts use many visual cues such as position, size, proximity, and color to measure and help you evaluate data within a visualization. Color by expression, available under the Colors and Legend settings, can use your own formulas that will determine the color scheme of your plotted data. More videos here: https://www.youtube.com/watch?v=ZuXL7dEU7Hg&list=LLT4ht1ywCRR25eaURC-j6CA
