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Figure 3
(a) The sum of the squares of each hkl reflection where k + l, h + l, h + k = odd, normalized by k + l, h + l, h + k = even, respectively. Excluding reflections where h, k, l = 0. (b) Distortion mode amplitudes as a function of temperature with inset showing hybrid improper coupling in the A21am phase. Blue and green indicate the A21am and Pnab phases, respectively. |