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2D RDFs illustrate the distributions of POPC headgroups and acyl chains around DAG in POPC/6.25%DAG system and around POPC in pure POPC bilayer. The position of a POPC headgroup was taken as the midpoint of its P-N vector, and the center of mass of two acyl chains from the same POPC was used to represent the position of POPC chains.
