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Figure 1
Atom combinations that contribute to the real-space correlation function [\Theta(r,r',\theta)] with three atoms (a) and four atoms (b). The four-atom contributions are insensitive to the separation between the two pairs of atoms.

IUCrJ
Volume 4| Part 1| January 2017| Pages 24-36
ISSN: 2052-2525
https://doi.org/10.1107/S2052252516016730