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Mean bond-length distribution of [8]Ca2+ bonded to O2− (a). Bond-length distribution for [8]Ca2+ bonded to O2− are shown for configurations with a mean bond length (b) less or equal to 2.44 Å (superimposed with its mean bond-length kernel-density estimation; n = 568), and (c) greater than 2.44 Å (n = 3584). The effect of the former on the aggregate bond-length distribution is shown via kernel-density estimation (d).
