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SCr # # # #
Immediately change the color representation for the specified color
index. The first number is the color index and the following three
numbers give the red, green, and blue color intensities and must lie
in the range 0.0 to 1.0. This command only works on color devices
for which the color representation can be changed.
Examples:
PLT> SCR 0 1. 1. 1. ! Set the background color to be white
PLT> SCR 1 0 0 0 ! Plot color index 1 in black
PLT> SCR 2 0 1 0 ! Plot color index 2 in green
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