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Figure 2
Details of the three individual tilt modes that contribute to the B1a1 model. Simulated mode amplitudes of 0.5 Å (ISODISTORT) have been used for illustration. Each plot shows an isolated triple-octahedral block view perpendicular and parallel to the unit cell axis c in the B1a1 setting. (a) The X3+ mode, showing out-of-plane (ab) tilting. (b) The X1− mode, showing anti-phase rotation of the two outer octahedral layers only around c. (c) The X2+ mode, showing rotation of the inner octahedral layer only around c.

IUCrJ
Volume 6| Part 3| May 2019| Pages 438-446
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519003804