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Thanks Greg/Justin.
Greg - it does vary with temp as you would expect. The graphs show the SNR for two data sets - one for an ambient of 14C (this was basically constant throughout this test) and then another where ambient varied from 5.5 down to 3 C during the test (and this variation should be taken into account when interpreting the results. ideally I should do it again when temps are expected to be more constant). Its done by taking a series of dark frames only, and then measuring the standard deviation of each dark frame (across the entire frame). Roger Clark's website gives the formulae for then calculating relative SNR.
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