Table 1: Quality of the fit for all alkaline earth interactions. Distance regime 𝑟 𝐴 𝐵 in Å and absolute and average deviation in kJ/mol. Absolute deviation includes weights; average deviation is weight-free.

Pair 𝑟 𝐴 𝐵 𝑁 r e f Abs. dev. Avg. dev.

Be-Be 2.0 10.0 81 47.43 0.59
Be-Mg 2.5 15.0 126 25.71 0.20
Be-Ca 2.7 15.0 124 25.80 0.21
Mg-Mg 3.0 15.0 121 13.79 0.11
Mg-Ca 3.2 15.0 119 11.42 0.10
Ca-Ca 3.5 15.0 116 16.60 0.14