The PLplot Plotting Library: Programmer's Reference Manual
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plscmap1n: Set number of colors in color map1

plscmap1n (ncol1);

Set number of colors in color map1, (re-)allocate color map1, and set default values if this is the first allocation (see the Section called Color Map1 in Chapter 3).

ncol1 (PLINT, input)

Number of colors that will be allocated in the map1 palette. If this number is zero or less, then the value from the previous call to plscmap1n is used and if there is no previous call, then a default value is used.

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plscmap1l: Set color map1 colors using a piece-wise linear relationshipUpplscol0: Set a given color from color map0 by 8 bit RGB value