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This algorithm is similar to one developed by Andy Salnikov and implemented in cspad_mod.CsPadCalib;in https://github.com/lcls-psana/pdscalibdata/blob/master/src/CsPadCommonModeSubV1.cpp:

1. for each cspad2x1 sensor an intensity histogram is filled with pedestal-subtracted ADU values (1 bin for each possible ADU value). pixels with bad status are ignored
2. software finds where histogram crosses threshold (parameter 3)
3. measure mean/rms of region that is above the threshold
4. if mean/rms is in allowed range (parameters 1 and 2) then common mode value is set to the mean.
5. if the correction is not in the allowed range, and par[4]>0.1 (see below) then the common mode value is computed from unbonded pixels (see algorithm #5)
6. subtract the common mode value from all pixels in the cspad2x1

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