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Average number of water molecules that penetrate inside the hydrophobic core of the membrane (within 10 Å from the membrane center) as a function of the location of the center of mass of the permeating NATA molecule z. As the permeant is getting closer to the membrane center (z=0) the number of water molecules at the hydrophobic core increases first but then decay when NATA is at the center. This decay is slightly different for the two layers.
