It does not appear that the current colormaps used are perceptually uniform. This tends to create artificial visual artifacts when looking at the heatmaps. For example, if you look between 69F and 72F, there seems to be a big "visual" change. However between 72F and 75F, there is a much less change. A perceptually uniform heatmap would not have this issue.

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Option to use perceptually uniform colormaps