OptionalcolorA static color string (for example, '#FF0000').
OptionalcolorA named color scheme (for example, 'blues', 'viridis', 'spectral').
OptionalcustomA custom three-stop diverging gradient.
OptionalcustomA custom two-stop sequential gradient.
OptionalfromA 0-based index into the visualization color palette, where 0 is visualization_color_01. Valid values are 0 to 19.
The gradient for one color mode. Set at most one field.