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Selected examples for the variation of the running coordination number N RCN with R in reference data sets. Cu2+—Cl−: two plateaux within the first coordination shell due to prevalent (4+2) coordination. Rb+—Sb3−: two plateaux due to subsets of varying N C from 4 to 6 in the reference data. Cr4+—O2−: one single plateau. Tl+—O2−: no obvious plateau.
