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Histograms of combined figure of merit (CFOM = CCall + CCweak) from SHELXD for 10 000 trials for the first 360° from crystal 1, 1 + 2, 1 + 2 + 3 and 1 + 2 + 3 + 4. As may be expected from the merging statistics, the data from two, three and four crystals give increasingly successful substructure determination.
