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Figure 10
The crystal structures of (a) BSEM (1), (b) TSEM (2) and (c) the basic structure of ESEM (3) viewed down the monoclinic axis [010]. Color codes as in Fig. 7[link]. H atoms have been omitted for clarity. Symmetry elements with the exception of the glide planes are indicated by the graphical symbols standardized in International Tables for Crystallography (Hahn, 2006aBB28). Boundaries between the A and B layers are indicated by dashed lines.

IUCrJ
Volume 2| Part 5| September 2015| Pages 584-600
ISSN: 2052-2525
https://doi.org/10.1107/S2052252515011665