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Run numbers are shown in histogram titles:
Bad pixels are removed. Top-left plot has a peak at "0", which arose in the difference of two ~820x820 plots from regions between ASICs.
The difference between dark image amplitudes at High and Low gain mode is ~155 ADC units.
Comparison of runs 899 and 904 (transm.=0.1) gives the gain ratio High/Low = 495/66 = 7.5
Comparison of runs 902 and 903 (transm.=0.05) gives the gain ratio High/Low = 26/4.5 = 5.8. So, the gain is not a lilear function of intensity...
Gain Correction Factors
Run 901 transm=0.002
Run 902 transm=0.005
Run 903(low gain) transm=0.005
Run 904(low gain) transm=0.1
Run 905(low gain) transm=0.5
Run 906(low gain) transm=1
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