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Figure 1
Illustration of the rigidity index: the NO2 group attached to a molecule R is considered rigid if the average of [\delta _{i}^{{\rm out}}] is twice as large as the average value of [\delta _{i}^{{\rm in}}].

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 48| Part 6| December 2015| Pages 1785-1793
doi:10.1107/S1600576715018075
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