The PLplot Plotting Library: Programmer's Reference Manual
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plhls: Set current color by HLS

plhls (h, l, s);

Set current color by hue, lightness, and saturation. Convert hls color coordinates to rgb, then call plrgb. Do not use this. Only retained for backward compatibility

h (PLFLT, input)

NEEDS DOCUMENTATION

l (PLFLT, input)

NEEDS DOCUMENTATION

s (PLFLT, input)

NEEDS DOCUMENTATION

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plhist: Plot a histogram from unbinned dataUpplinit: Initialize PLplot