Figure 4.

Membrane tension $\overline{\Sigma }$ as a function of molecular area $\overline{A}$ for three different chain lengths of 3, 4, and 5 per tail chain, in the old (a) and new (b) parameter set. There is no state with zero tension for bilayers formed from lipids with three beads per chain in the old parameter set (a), since at low $\overline{A}$ values the bilayer structure is not stable.