Dehydration: Headgroup and backbone. The two force fields behave astonishingly alike. This is rather interesting, especially as the water models were not the same: SPC and the CHARMM-specific TIP3P. oleoyl (sn-2) chain for the saturated palmitoyl (sn-1) tail. However, unlike for the saturated tails in Fig. , here the forking on the carbon segment 2 is observed. Empty symbols denote the S CH extracted from the crowded spectral region (see Fig. ).