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Figure 3
The reciprocal lattices of cP, cI and cF. (a) cP* ↔ [hR^*_{\rm r}] ↔ [hR^*_{\rm h}]. (b) cI* [\Leftrightarrow] [hR^*_{\rm r}] ↔ [hR^*_{\rm h}]. (c) cF* [\Leftrightarrow] [hR^*_{\rm r}] ↔ [hR^*_{\rm h}]. The equally drawn reciprocal unit cells for P *, I * and F * are red in (a) but dark grey in (b) and (c). I * and F * have an incomplete occupation of the corners with reciprocal-lattice points. Therefore, the reciprocal-lattice point arrangement appears like a face-centred lattice for I * in panel (b) but like a body-centred lattice for cF * in panel (c). The red frame represents in each panel the primitive cell, which is rhombohedral in (b) and (c). The hexagonal cell (green) results in a primitive superlattice when the red centred reciprocal-lattice points have not been discovered by Kikuchi bands.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 56| Part 2| April 2023| Pages 367-380
https://doi.org/10.1107/S1600576723000845
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