short communications
In equation (2.7) of Hauptman [Acta Cryst. (1982), A38, 632-641] 2θjH should be replaced by 2δjH. On the seventh line of equation (3.34), CHCKCL - CHSKSL should be replaced by CHCKCL + CHSKSL. On the sixth line of equation (3.51), replace RRR cos ζ2 by RR2R cos ζ2. On the line immediately following equation (3.54), ωjB should be replaced by ωj, B.