The average contributions of all protein–ligand atom pairs (the second column), metal–ligand atoms (the third column) and potential hydrogen bond atom pairs (the fourth column).

Distance bin	All protein–ligand atom pairs	Metal–ligand atom pairs	Potential hydrogen bond atom pairs
1–2 Å	0.000744086	0.000782901	0.000965695
2–3 Å	0.000673414	0.000726316	0.001076624
3–4 Å	0.000620728	0.000709823	0.001069695
4–5 Å	0.000613829	0.000687995	0.000931523
5–6 Å	0.000611377	0.000657787	0.000936977
6–7 Å	0.000610085	0.000628505	0.000871954
7–8 Å	0.000613386	0.000620942	0.000897092