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Dimensionless effective diffusion constant, Deff(r)∕D(a), as a function of the dimensionless particle radius, x=r∕a, for the case of dead ends with no cavities, Vcav=0. The curves from top to bottom correspond to α=0,2,5,10,20. All curves merge into one, Deff(r)∕D(a)=1∕x, at x>1 since Deff(r)=D(r)=D(a)a∕r at r>a.
