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Figure 1
(a) The S12 index for the two probability distributions is 3.4, yet the percentage difference seems to be larger. (b) The overlapping (common) area is 0.78 (marked A). The overlapping coefficient of the PDFs corresponds to the area which would translate to a 22% difference.

IUCrJ
Volume 11| Part 2| March 2024| Pages 249-259
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524001507