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Effective diffusion coefficient as a function of the driving force at different values of the radius variation rate λ = 0.8, 5, 25, 100, 500, and ∞, and a = 0.2R, l = 2R, and L = (1 − 0.8/λ) l. Thin solid curves are drawn through the symbols that represent our numerical results. Thick dashed lines show asymptotic behaviors, Eqs. 1, 3.
