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Figure 1
The crystal structures of Se-I (a) and Se-V′ (b). Unit-cell edges in the directions that contract with increasing pressure are shown in green, while those in the directions that expand with increasing pressure are shown in red.

IUCrJ
Volume 9| Part 2| March 2022| Pages 165-166
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522001312