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Similar to Fig. 3 but for an ion at the center (z = 0) of a finite cylindrical channel. In B, the lower solid line on each side shows Uc due to the protein charges at the mouth of the channel, whereas the upper one is due to the centrally placed charges. The dotted and dashed lines show the results for the plane and infinite cylinder boundaries from Figs. 3 and 4 as before.
