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Deuterium order parameters for the tail groups as a function of position on the sn-1 (upper) and sn-2 (lower) hydrocarbon chain. Values are shown for the polarizable (CHEQ) and nonpolarizable (C27) models, as well as for the revised CHARMM force field for alkanes (C27r) (74). Experimental data (60) for the asymmetric sn-2 chain (lower) are also shown, with the star and X symbols marking the values for the 2R and 2S hydrogens, respectively.
