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Figure 7
Probable twinning mechanism in DH-I. The Na+/H2O section is mirrored perpendicular to b, with an accompanying shift of ½b for the bottom layer of naproxen molecules. The resulting structure (blue) is identical to the starting structure (red) rotated 180° around b.

IUCrJ
Volume 1| Part 5| August 2014| Pages 328-337
ISSN: 2052-2525
doi:10.1107/S2052252514015450