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2-dimensional relative free energy map of hydrogen-bonding clusters, (MamH+ MguanH+PO4−)x(H2O)y (lipid phosphate and water forming hydrogen bonds with the charged analog), in different regions (Outer interface: |z|>22 Å; Interface: 22Å≥|z|>13Å; Outer core: 13Å≥|z|>4Å; Central core: |z|≤4Å).
