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1,350 bytes added ,  23:13, 2 July 2009
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This is it to start. type <pre>#> xds_par </pre> to run xds and wait until it's finished.
 
This is it to start. type <pre>#> xds_par </pre> to run xds and wait until it's finished.
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== Indexing Fails ==
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If the detector origin is too far from the image centre, IDXREF is going to stop with the error message
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!!! ERROR !!! SOLUTION IS INACCURATE
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Do the following:
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<source lang=fortran>
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# In IDXREF.LP, find the table '''INDEXING OF OBSERVED SPOTS IN SPACE GROUP'''
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***** INDEXING OF OBSERVED SPOTS IN SPACE GROUP #  1 *****
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  16196 OUT OF  76452 SPOTS INDEXED.
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      0 REJECTED REFLECTIONS (REASON: OVERLAP)
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  60256 REJECTED REFLECTIONS (REASON: TOO FAR FROM IDEAL POSITION)
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EXPECTED ERROR IN SPINDLE  POSITION    2.398 DEGREES
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EXPECTED ERROR IN DETECTOR POSITION      1.72 PIXELS
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</source>
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Unless really hardly any reflections could be indexed (second line in the table), scroll a few lines up and copy the refined values for the beam origin
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DETECTOR ORIGIN (PIXELS) AT                    1514.16  1537.27
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as improved ORGX and ORGY to [[XDS.INP]] and try indexing again.
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XDS is quite robust and in many cases this approach works
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# Check the refined detector distance
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DETECTOR ORIGIN (PIXELS) AT                    1514.16  1537.27
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CRYSTAL TO DETECTOR DISTANCE (mm)      422.92   
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If it deviates by more than 1-2mm from the input distance, check all you parameters again. Is the wavelength really correct, as well as the distance? If you are sure about them, try indexing with only a few images
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SPOT_RANGE = 1 20
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