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Figure 1
(a) The power of FXS is that, summing the products of intensities with two different q values and with constant angular separation [\Delta\phi], one obtains not only the interatomic vector distance lengths as from standard 1D PDF, but also (b) the angle between two interatomic vectors. These can share a common atom (three-body correlation) or not (four-body correlation).

IUCrJ
Volume 9| Part 2| March 2022| Pages 167-168
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522002044