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(Color online) Current as a function of KCl molarity for various neck radii and at a fixed bias of 1.0 V. For relevant experimental molarities, we observe an almost linear increase of the current for a radius r = 10 and a non-linear behavior approaching a saturation at a given molarity for smaller radii. The current saturation and decrease is shown explicitly in the left inset for a 7 Å neck radius pore. We also show the increase in current with voltage in the other inset.
