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This is a schematic representation of a typical conductance-distance trace in the opening process of the two electrodes. The total conductance (G, red solid line) of a single-molecule junction is composed of the through-space tunneling (Gs, transparent black line) and through-molecule tunneling (Gm, transparent red line) contributions. After breaking down of the junction, a gold-molecule-solution-gold channel (Gc, transparent green line) appears. The three gray areas show regions in which the conductance cannot be measured.
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