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short communications
Typesetting errors in the paper by Dumas [Acta Cryst. (1994), A50, 537–546] are corrected. On page 538, column 2, line 7, 〈F2H 〉 > −ΣH should be replaced by 〈F2H 〉 − ΣH. Equation (34) should read
Equation (45) should read