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Hi Rob,
Unfortunately gratings are not equally efficient at all wavelengths (The efficency of the blazed Star Analyser grating peaks at ~500-550nm in the green and drops off into the red and blue) so summing the light in the spectrum without correcting for this will introduce a colour cast. (The zero order contains most of the rest of the light missing from the spectrum and usually appears red-ish if not not overexposed)
Robin
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