Upper panel: velocity dispersion () against the H₂ column density () for the S242 main skeletons. The magenta dots represent the skeleton structures in both end-clumps, the green dots are other skeleton regions not located in the end regions, the open green circles represent the value in the length ranges of ~6.5–8.5 pc and 13.5–15.5 pc, which are calculated by the main one of the two velocity components. The vertical lines on the individual data points show their uncertainties. The black line is the best linear fit for and ; the fitted slope parameter (K) is 0.62 ± 0.07. The cyan lines show the characteristic of α_vir = 2.0. Lower panel: Log-scale of α_vir histograms for the S242 main skeleton, the S242 main skeleton with ≥ 1.0e22, and the S242 skeleton with < 1.0e22, respectively. All histograms are weighted by the value of H₂ column density.