Plot relating the osmotic work to dehydrate the hexagonal phase to the change in monolayer curvature, 1/Rp, for 18:0d35-22:6n-3PE (squares), 18:0d35-22:5n-6PE (triangles), and 18:1n-9-18:1n-9PE (circles). The fit to the data points yields the bending elastic modulus, Kcp, and the spontaneous radius of monolayer curvature, R0p.