In addition to the average conductance values, the width of the conductance distributions in 1D conductance histograms provides valuable insights into the electronic properties of molecular junctions. Broad conductance distributions often arise from variations in junction conformations, whereas narrow or tight conductance distributions typically indicate a more rigid or shape-persistent structure . We determined the full width at half maximum (FWHM) of the primary conductance peaks by fitting the 1D conductance histograms to a Lorentzian function . For the ladder molecules (L1-PF6, L2-PF6, L3-PF6, L4-PF6), the FWHM was found to be 10 0.41 (≈ 2.6), 10 0.69 , 10 0.75 , and 10 0.84 for the primary conductance peaks, respectively. In contrast, the non-ladder molecules (N1-PF6, N2-PF6, N3-PF6) exhibited significantly broader conductance distributions with FWHM values of 10 1.3 , 10 2.3 , and 10 2.5 (≈ 316) for the primary conductance peaks, respectively. These results indicate that laddertype molecules tend to have significantly narrower distributions in molecular conductance compared to non-ladder molecules. In addition, for both ladder and non-ladder molecules, the FWHM increases with molecular contour length, which suggests an increase in variation in the junction conformation for longer molecules.