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The area densities n 1 and n 2 of lipids belonging to a given leaflet as a function of the distance, ξ, from the membrane midplane. The range occupied by the longest and shortest lipids is shown above. n p total number of lipids belonging to a given leaflet per unit surface area, L average lipid length, δL width of the lipid length range, x = d − 2L, where d is the total membrane thickness
