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Figure 4
Thermal evolution of the four most significant modes: (a) X1− and X3+ tilt modes and Γ5− polar mode. Note that in the expanded plot on the right, all three modes feature a plateau towards TC. (b) X2+ tilt mode. The mode amplitudes are normalized relative to the common parent unit cell (parameter Ap in ISODISTORT).

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