plscolbg: Set the background color by 8-bit RGB value

The PLplot Plotting Library: Programmer's Reference Manual
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	    plscolbg

(r, g, b);

Set the background color (color 0 in color map 0) by 8-bit RGB value (see the Section called Color Map0 in Chapter 3).

r (PLINT, input): Unsigned 8-bit integer (0-255) representing the degree of red in the color.
g (PLINT, input): Unsigned 8-bit integer (0-255) representing the degree of green in the color.
b (PLINT, input): Unsigned 8-bit integer (0-255) representing the degree of blue in the color.

Redacted form: plscolbg(r, g, b)

This function is used in examples 15,31.

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`plscol0a`: Set a given color from color map0 by 8 bit RGB value and double alpha value.	Up	`plscolbga`: Set the background color by 8-bit RGB value and double alpha value.