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1,186 bytes added ,  20:13, 27 November 2015
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  echo "set yrange [] reverse ; plot 'SPOT.XDS' us 1:2 w dots" | gnuplot -persist
 
  echo "set yrange [] reverse ; plot 'SPOT.XDS' us 1:2 w dots" | gnuplot -persist
 
This may also help to find shaded regions on the detector.
 
This may also help to find shaded regions on the detector.
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=== ugly diffraction pattern ===
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If the spots are split or unclean, you may get a seemingly terrible match between observed and calculated spot positions:
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***** REFINED SOLUTION BASED ON INDEXED REFLECTIONS IN SUBTREE # 1 *****
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REFINED VALUES OF DIFFRACTION PARAMETERS DERIVED FROM      2916 INDEXED SPOTS
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REFINED PARAMETERS:  AXIS BEAM ORIENTATION CELL
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STANDARD DEVIATION OF SPOT    POSITION (PIXELS)    11.74
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STANDARD DEVIATION OF SPINDLE POSITION (DEGREES)    5.94
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which leads to very many reflections being rejected from refinement:
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  ***** INDEXING OF OBSERVED SPOTS IN SPACE GROUP #  1 *****
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      1594 OUT OF    27897 SPOTS INDEXED.
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        0 REJECTED REFLECTIONS (REASON: OVERLAP)
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    26303 REJECTED REFLECTIONS (REASON: TOO FAR FROM IDEAL POSITION)
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The fix is to e.g. double the parameters
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MAXIMUM_ERROR_OF_SPOT_POSITION=  6.0
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MAXIMUM_ERROR_OF_SPINDLE_POSITION=  4.0
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which then leads to less rejections:
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***** INDEXING OF OBSERVED SPOTS IN SPACE GROUP #  1 *****
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    11669 OUT OF    27897 SPOTS INDEXED.
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        2 REJECTED REFLECTIONS (REASON: OVERLAP)
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    16226 REJECTED REFLECTIONS (REASON: TOO FAR FROM IDEAL POSITION)
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and surprisingly good integration.
    
=== IDXREF ends with !!! ERROR !!! message ===
 
=== IDXREF ends with !!! ERROR !!! message ===
2,527

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