Variations in lightness make these schemes ideal for mapping orderable or numeric data that progress from low to high using colors that range from light to dark (or vice versa).
Highlight values above and below an interesting mid-point in quantitative data with these schemes. The middle color is assigned to the critical value with two sequential type palettes at either end assigned to values above or below.
Demonstrate categorical differences in qualitative data with these color schemes that use different hues with consistent steps in lightness and saturation.
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