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Suavi,
Using your data above and assuming the worst case gain of 0.26 you're only talking about a difference of 0.1e- noise between the master bias and superbias. In practice that's going to be swamped by read noise and shot noise.
I've done some comparisons between using a master bias and superbias with SRO data and it doesn't make a measurable difference to my final results (I went through the whole process of calibrating and integrating several sets of data.) If we did a poor job of collecting bias frames then the results might be different, but with an adequate supply of bias frames (50+ in this case) it didn't really help.
Cheers,
Rick.
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