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Current vs. voltage curves at various emitter–counterelectrode distances for (A) a single emitter, (B) a linear array of 19 emitters, and (C) a circular array of 19 emitters. The flow rate was 50 nL/min in (A) and 950 nL/min in (B) and (C), and the plotted currents are the average current per emitter for (B) and (C). The solution was 1:1 H2O:MeOH + 0.1% HOAc.
