Visible spectrum gradient fill

I am grateful for the helpful responses.

One of the spectra JPGs from Gernot's first link looks similar to a 'real' white light continuous spectrum, and will be suitable as a 'background for the graph.

Thanks again.

Mike

Mike,

you are welcome. If you want a quality graphic with specified RGB distributions - this can be easily programmed.
Just necessary to know the mathematical description.
Will do some experiments when I have time.

Best regards --Gernot

Good job, Gernot...I KNEW you'd come through on his request!