Fig. 5. Clustering analysis of the conductance properties of P1. (a–c) Two-dimensional histograms of the three different categories of breaking traces obtained from the reference-free cluster analysis applied to P1. (d) One-dimensional conductance histograms corresponding to classes A, B and C. By fitting a log-normal distribution to the one-dimensional histograms, we can extract the conductance peak positions at 2 × 10–4 G0 for class A (64.7% of the molecular traces), 3 × 10–5 G0 for class B (28.8%) and 2 × 10–6 G0 in the case of class C (6.5%).
