| Description: |
specifies the background color for the outermost graph, or the color of the summary
node for subgraphs. Colors are black, blue, red, green, yellow, magenta, cyan, white, darkgrey, darkblue, darkred, darkgreen,
darkyellow, darkmagenta, darkcyan, gold, lightgrey, lightblue, lightred, lightgreen, lightyellow, lightmagenta, lightcyan,
lilac, turquoise, aquamarine, khaki, purple, yellowgreen, pink, orange and orchid. If more than these default colors are needed,
a color map with maximal 256 entries can be used. The first 32 entries correspond to the colors just listed. A color of the
color map can selected by the color map index, an integer, for instance red has index 2, green has index 3, etc.
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| Values: |
aquamarine, black, blue, cyan, darkblue, darkcyan, darkgreen, darkgrey, darkmagenta, darkred, darkyellow, gold, green, khaki, lightblue, lightcyan, lightgreen, lightgrey, lightmagenta, lightred, lightyellow, lilac, magenta, orange, orchid, pink, purple, red, turquoise, white, yellow, yellowgreen, integer |