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Effective diffusion coefficient Deff normalized to its counterpart in space with no constraints D0 as a function of L∕a, where L is the length of a conical section (half period of the structure) and a=Rmin is the minimum radius of the tube. Symbols show the results found in Brownian dynamics simulations at λ=0.5 (circles) and λ=1.0 (squares). Dashed curves are drawn through the symbols to visualize the dependences. Solid lines are the dependences predicted by Eq. 14.
