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An upper limit for the volume of unit cells which can be verified by the de Wolff figure of merit [Wolff, P. M. de, J. Appl.Cryst. (1968). 1, 108-113] is given as a function of the errors in observed d spacings. In the use of the de Wolff figure of merit the requirement of information about the errors of measurement is emphasized. A number of examples are given where the unit cells that are found cannot be accepted as true, because of the lack of accuracy in the published data.

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