Use an mpl LinearSegmentedColormap #262
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This PR modifies the palette handling code, replacing the previous ListedColormap with a LinearSegementedColormap, which does perform linear color interpolation - as opposed to the previous one, which did nearest neighbor interpolation, thus causing some duplicate colors to appear in the final palette.
For comparison, here is the previously generated palette values for the
pr_annual_absolute_model_ensemblecoverage configuration:and here is the palette, as generated by this PR: