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Figure 8
The structure of silicon viewed along the (111) plane. The [111]* reciprocal lattice direction is horizontal. The figure exposes the corresponding structural gap (as also appears in Fig. 7[link]).

IUCrJ
Volume 8| Part 5| September 2021| Pages 793-804
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521007272