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Ah, so it's to do with the specific randomness of photons arriving (is this Poisson theory too?).
I've seen it applied to dark noise, but maybe it doesn't apply to read noise as I always see it squared first before being added tot he rest of the terms, then the square root taken, as in;
SNRstack = (Sobj * Csubs)/SQRT(Csubs * (Sobj + Sskyfog + DC + RN^2))
Best,
Markus
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