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Geometry of the hydrocarbon chains. (a) Normal N is perpendicular to the plane of the bilayer, and the long axis along the all-trans chain is tilted by θ. (b) Looking down the chain axis, the carbons in the zigzag chain are shown by dark circles that define a plane perpendicular to the paper that is rotated by γ relative to vector V that is in the chain tilt plane shown in (a).
