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short communications
The lattice parameter of the title compound was found from X-ray Rietveld refinement to be 12.5755(1) Å; in addition to the diffractometer zero point, the specimen surface displacement was also varied. The estimated atomic positions of O and H atoms obtained from several refinements are in agreement with the values reported previously either from neutron or X-ray data. The degree of serial correlation in residuals was evaluated using the Durbin-Watson d statistic.