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Preset greyscale-visible color palette #158

@zhizhongpu

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@zhizhongpu

@jmshapir we often need to plot figures with colors. When plots need >3 non-black-non-white colors, the choice of a palette of colors becomes obscure and the developer may take some time to figure out what palette looks distinct in greyscale or is robust to various types of color vision deficiency.

I wonder if we can have a palette.json file in the lib directory that specifies one palette of colors (in hex codes) for each of the following number of colors per plot: 3, 4, 5, 6.

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