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Calculated (zero-bias) transmission functions of the (−S), (−CH2S), (−NC), (−Pyr), and (−Pyrad) systems at different packing densities Θ (Θ = 1 (SAM): darkly shaded, solid lines. Θ = 1/16 (single molecule): lightly shaded, dotted lines). The Fermi level EF is used as the energy reference.
