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Figure 15
Histograms of the mean-square displacements of the Bi mode sets for each symmetry operation of [Fd {\overline 3} m], summed over all k and 320 ensembles. The amplitudes and breadths of the MSDs show that the face-centering [+([{1\over 2}], 0, [{1\over 2}]), +(0, [{1\over 2}], [{1\over 2}])] and inversion (i) symmetry operations are not well followed by the Eu, T2u and T1u(2) representations.

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