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Anything Richard Walker say's is worth listening to!
The difference for me is that the other variables he mentions depend on the object under observation and the altitiude etc etc.
There is a basic underlying "correction" you can apply to ALL your spectra which at least will correct/ compensate for the the scope/camera/ spectroscope issues/ problems. The other factors you can address later.
What's the concern with doing a continuum normalisation? I can help.
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