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Figure 4
The independent components of (4), showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. The cations depicted lie across centres of inversion, and atoms marked `a' or `b' are at the symmetry positions (1 − x, 1 − y, 1 − z) and (−x, 1 − y, −z), respectively.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 60| Part 1| January 2004| Pages 65-75
doi:10.1107/S0108768103026739
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