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Mean bond-length distributions for the configurations of the alkali-metal ions bonded to O2− with a sample size of 100+ coordination polyhedra: (a) [4]Li+, (b) [6]Li+, (c) [4]Na+, (d) [5]Na+, (e) [6]Na+, (f) [7]Na+, (g) [8]Na+, (h) [6]K+, (i) [8]K+, (j) [9]K+, (k) [10]K+, (l) [12]K+, (m) [10]Rb+.
