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COLOR_CHANGE=<expression>,<max> 
(in GPLOT and PLOT operations for families of curves)
selects the line color for each curve individually according to the
<expression> depending on any of the cycling parameters. The color
indices are selected modulo <max>. Then the possible values are
0,1,2,...,<max>-1 .

Each color may be selected separately by COLOR(n) specifications.

For example,
GPLOT Y(X)=A
YSCALE=0(1)15 X=[line_width(15)],-10,10,20
COLOR_CHANGE=A   A=0,15,1
displays the entire 16 color palette as horizontal bars.

  S = More information on GPLOT specifications