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. 2015 May 18;5:10417. doi: 10.1038/srep10417

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The conductivity, σ, as a function of P_M during heating. The solid line fits the data correspond to the two-dimensional (2D) percolation model, σ, ∝ (P_M – P_C)^t; the inset shows a log-log plot of σ, versus (P_M – P_C), where P_C is the percolation threshold.