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short communications
It is demonstrated that a recent publication by Tindle [Acta Cryst. (1984), A40, 103-107] on the normalization of resolution functions for a three-axis spectrometer is in error. The complete normalization factor derived by this author is the same as that obtained in previous works. However, Tindle's interpretation of data for the peak reflectivity of mosaic crystals is incorrect. This error leads him to contradict erroneously previously published results.