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Illustration of the parameters used for modeling a parabolic tip poking into a membrane spanned over a hole of radius Rpore. c denotes the axial distance of the contact point between membrane and tip, σ the lateral tension, Rtip the radius of curvature of the tip, h0 the penetration depth in the pore center, F the normal force exerted by the tip, and h(ρ) the shape of the membrane as a function of displacement from the center of the pore.
