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• source (default: "DetInfo(:Cspad)") – input source of data
• inputKey (default: " " ) – key for input data, by default use raw data
• outputKey (default: "bkgd_subtracted" ) – output key for the next data processing stage

• Wiki Markup
  {{bkgd_fname}} (default: "cspad_background.dat" ) -- file with CSPad array \[4*8*185\]\[388\] of averaged background

• norm_sector (default: 0) – CSPad sector in quad from 0 to 7
• print_bits (default: 0) – module verbosity:
  • 0 - print nothing,
  • 1 bit (1) - input pars,
  • 2 bit (2) - event ID,
  • 3 bit (4) - normalization factor for each event,
  • 4 bit (8) - part of the background array.

Example of the module application

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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:

As a cross check, the averaged over the same 1000 events array with subtracted background is shown below.
As expected, it is about zero.
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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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