plrgb: Set line color by red, green

The PLplot Plotting Library: Programmer's Reference Manual
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### `plrgb`: Set line color by red, green

`plrgb` (r, g, b);

Set line color by red, green, blue from 0. to 1. Do not use this. Only retained for backward compatibility. Use the function `plscol0` instead.

`r` (`PLFLT`, input) NEEDS DOCUMENTATION `g` (`PLFLT`, input) NEEDS DOCUMENTATION `b` (`PLFLT`, input) NEEDS DOCUMENTATION

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