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Figure 12
(a) The O A1g representation, carrying the largest magnitude of all degrees of freedom for the 48f O atoms. (b) Vectors depicting the O A1g mode surrounding a linear O′—Bi—O′ group illustrate how the O atoms move out of the plane in which the modes of the Bi T2u representation act (as illustrated in Fig. 11[link]). While all vectors are illustrated, not all of the atoms shown are spanned by a single irreducible representation (i.e. those related by face centering are included).

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CRYSTALLOGRAPHY
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