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SDF of water O atoms around the hydronium H atoms (left, side view; right, top view) for a system comprised of an excess proton in bulk water. The different colors denote different H–O distance ranges. Only SDF > 3 is shown. Green, 0.0 Å < rH0–O < 2.0 Å; blue, 2.0 Å < rH0–O < 2.5 Å.
