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Bending rigidity of a POPC lipid bilayer membrane measured at different field frequencies. Solutions contain 0.2 mM NaCl inside (λin = 42 μS/cm) and no salt outside (λex = 2 μS/cm). Values obtained from population averages over 12-15 vesicles. Field amplitude is increased from 2 to 10 kV/m with steps of 0.5 kV/m.
