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Hmmm
If the sub has an average (in spectroscopy the Plank distribution curve always has a peak/ rise somewhere, so KISS, and use an "average") of say 6400ADU (Shot noise = sqt =SNR=6400/80= 80.
If you sum 5 of these subs, the total signal becomes 32000ADU, and the shot noise =179, SNR = 179 a significant improvement?
If you average/ median combine then I'd think you'd still end up with (5 x 6400)/5 = 6400ADU???? and SNR probably less than 80 due to the manipulations???
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