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short communications
There are two errors in the short communication by Velmurugan & Hauptman [Acta Cryst. (1989). A45, 656]. On line 9 in the Abstract, Φ2h′2k′0 should read Φ2h2k0 and on line 3 in Summary of final results, Φ2h′2k′0 should read Φ2h,2k,0.