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Run 907 dark image for low gain
run 908 dark image for low gain (dark rate is subtracted using r907)
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, difference between two dark rate images
Run 909 transm=1 low gain (dark rate is subtracted using r907)
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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...
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