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• For CSPAD with moving quads (i.e. for CXI) optical measurement is done separately for each quad. The numeration of corners is shown in the plot:
  
  For each quad measurement is started from the point #1 which in assembled detector is closest to the beam. The 1-st point (x,y,z) coordinates are re-set to (0,0,0) in the beginning of measurements. At the end, it is checked that the 1-st point coordinates are reproduced within precision of measurement.
• For CSPad with fixed quad geometry (i.e. for XPP) optical measurement is done for entire detector. The 1st corner of 3-rd quad (x,y,z) coordinates are re-set to (0,0,0) in the beginning of measurements for the, as shown in the plot
  

Corner coordinates are measured in um (micrometers) and are saved in the xlsx format table.
Then, xlsx format table is converted by hands to text format in order to feed the python script for quality check and getting calibration parameters for 2x1 center coordinates and tilt angles.

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