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Bond-length distributions for the configurations of the alkaline-earth-metal ions bonded to O2− with a sample size of 100+ bonds: (a) [4]Be2+, (b) [5]Mg2+, (c) [6]Mg2+, (d) [6]Ca2+, (e) [7]Ca2+, (f) [8]Ca2+, (g) [9]Ca2+, (h) [10]Ca2+, (i) [12]Ca2+, (j) [7]Sr2+, (k) [8]Sr2+, (l) [9]Sr2+, (m) [10]Sr2+, (n) [12]Sr2+, (o) [6]Ba2+, (p) [7]Ba2+, (q) [8]Ba2+, (r) [9]Ba2+, (s) [10]Ba2+, (t) [11]Ba2+, (u) [12]Ba2+.
