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Figure 1
(a) The CRUSH approach to identifying rigid-unit modes involves stiff springs joining the two hypothetical halves of an atom. (b) The new approach of Campbell et al. instead requires zero mismatch (or sufficiently small mismatch in the case of quasi-RUMs) between the rotating adjacent units in order to avoid the type of splitting illustrated.

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ISSN: 2053-2733
Volume 74| Part 5| September 2018| Pages 406-407
https://doi.org/10.1107/S2053273318012007
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