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Mean bond-length distributions for the configurations of the alkaline-earth-metal ions bonded to O2− with a sample size of 100+ coordination polyhedra: (a) [4]Be2+, (b) [6]Mg2+, (c) [6]Ca2+, (d) [7]Ca2+, (e) [8]Ca2+, (f) [9]Ca2+, (g) [8]Sr2+, (h) [9]Sr2+, (i) [9]Ba2+, (j) [10]Ba2+, (k) [12]Ba2+.
