## 1.52.13 c1label

    set c1label <text> [ rotate <angle> ]

The setting `c1label` sets the label which should be written alongside the color scale bars drawn next to plots when the `colormap` plot style is used. An optional rotation angle may be specified to rotate axis labels clockwise by arbitrary angles. The angle should be specified either as a dimensionless number of degrees, or as a quantity with physical dimensions of angle.