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Two-dimensional conductance vs electrode displacement density histograms. The first (from the left) and second histograms are built up from 6 834 and 9 638 traces at 100 mV with ps-para-para- and ps-meta-para-PCP molecules, respectively. The third and fourth 2D histograms correspond to 3 780 and 10 000 traces at a bias voltage at 250 mV with ps-para-meta- and ps-meta-meta-PCP molecules, respectively.
