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The file with the background array, bkgd_fname, was obtained by averaging 1000 events using module CSPadArrAverage. Subtraction is done with normalization for norm_sector=0.
Event image and pixel amplitude spectrum before and after the background subtraction are shown in plots:
Other event with better subtracted background:
Events at the end of the run:
As a cross check, the averaged over the same 1000 events array with subtracted background is shown below.
As expected, it is about zero.
However, the image averaged over the half of this sample (500 events) shows systematic offset from zero, that tells about variation of the background in runtime
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