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short communications
In the paper by Nikulin, Sakata, Hashizume & Petrashen [J. Appl. Cryst. (1994), 27, 338–344], the lateral resolution in the two-dimensional maps was evaluated incorrectly. The correct value should be calculated from the full angular range of an individual transverse scan, which gives 0.325 μm in the experimental condition described, one half the old value.