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Figure 3
Views of the reciprocal volume along main directions of (a), (b) OPBA3 and (c), (d) OPBA4; reflection extinctions due to a glide plane are visible along the c* axis in (100) projections (a) and (c), integral extinctions due to C-centering of OPBA4 are evident in (d). The two directions a* and c* are not in the plane of the figure. Inserts in the bottom-right corners: enlarged central parts of the projections overlaid with the reciprocal lattice.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
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