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Images of water–triad and ion–triad interactions overlaid on a heatmap of water within 3.5 Å (inner circle) and 7 Å (outer circle) from the ion binding site. Structures are representative examples of water–ion–triad interactions during (A) bipyramidal K+ coordination, (B) nonlinear K+ coordination, (C) coplanar Na+ coordination, and (D) nonlinear Na+ coordination.
