There are many ways to style a data layer by a numeric field. For example, a Continuous style maps a color (or point size) for every unique value in your data, similarly to a categorical visualization. In this case, the color for each value is interpolated from the endpoint colors.

However, it’s more common to group values from numeric fields into classes (green from 0 to 5, yellow from 6 to 10, etc). Classes can be chosen manually or picked from one of Felt’s default classification methods:

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By default, the legend in a Standard Deviation classification does not show the breakpoint values, using instead the nº of standard deviations.

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