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Cumulative functions of the normalized Bijvoet differences x and Δ and their expectation values for a non-centrosymmetric crystal in which the group of normal scatterers is partly centrosymmetric are worked out for the cases when the number (P) of anomalous scatterers in the unit cell is one and many (MN and MC cases) respectively. The results are used to obtain the percentage of reflexions for which Δ ≥ 0.05. It is found that even when 50% of the normal scatterers form a single centrosymmetric group, the measurability of the Bijvoet difference is not affected significantly by the partial centrosymmetry of the group of normal scatterers.
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