Indeed, the largest quantitative discrepancies manifest not in the responses, but are inherited from the fullyhydrated case: The S CH magnitudes of g 3 , and especially g 1 , are too large. (Note, however, that the extents of their full-hydration forkings do agree with 2 H-NMR, see Fig. .) Dehydration: Tails. Figure displays dehydration effects on S CH at the beginning and end of tails in DMPC (left) and POPC (right). The tail responses of the two force fields are seen to be very similar, and their full-to-lowesthydration S CH changes in fair agreement with experiments. However, as the full-hydration S CH of OPLS4 match the experiments better (Fig. ), it often also follows the dehydration behavior more closely than CHARMM36. The only clearly opposite behavior to this trend is in the (sn-2) carbon segment 2, whose forking both force fields capture well, but CHARMM36 better the magnitude (Fig. ); also in the unsaturated (sn-2) segments 8 and 9, whose S CH both force fields overestimate at full hydration (but OPLS4 slightly more, see Fig. ), CHARMM36 remains slightly better as dehydration decreases the S CH (Fig. ).