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(MODEL (HLS|RGB)) | (VALUE index | (Black|Blue|Cyan|Green|Magenta|Red|White|Yellow)) Select color parameters. The MODEL option selects either the HLS (Hue - Lightness - Saturation) or RGB (Red - Green - Blue) color model. The INDEX option redefines an entry in the color lookup table. The index selected must be in the range 8 .. 255, since lookup table entries 0 .. 7 correspond to the 8 predefined named colors. The triple of values (v1,v2,v3) defines the (H,L,S) or (R,G,B) fractions (in range 0.0 .. 1.0), depending on the color model currently selected. The VALUE option selects a color for further plotting, either by lookup table index (range 0 .. 255) or by the name of one of the predefined colors.