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research papers
The diffractometer measurement of twinned and clustered crystals requires an accurate knowledge of Qi = UiBi matrices of single-crystal individuals contained in the sample. A determination of the Qi matrix is best done from several accurately centered orienting reflections diffracted by the ith single-crystal individual. The assignment of the orienting reflections to the individuals is easy for well resolved reciprocal lattices; for closely superimposed ones a method is presented which facilitates this assignment.