Color

Gnuplot supports two alternative sets of linetypes. The default set uses a different color for each linetype, although it also allows you to draw dotted or dashed lines in that color. The alternative monochrome set uses only dot/dash pattern or linewidth to distinguish linetypes. The set color command selects the color linetypes. See set monochrome (p. [*]), set linetype (p. [*]), and set colorsequence (p. [*]).