Distributions of a) clump effective radii, b) masses, c) H₂ column densities, and d) H₂ number densities. Open histograms represent the IR-dark clumps, while shaded histograms represent the IR-bright clumps (those with 8/24 μm emission). The solid and dashed vertical lines indicate the average values for IR-dark and IR-bright clumps, respectively. The average (median) radii for IR-dark and IR-bright clumps are 1.19 (1.14) and 0.96 (0.87) pc, respectively. The average (median) mass of IR-dark clumps is 3079 (2108) M_⊙, whereas that of IR-bright clumps is 1604 (804) M_⊙. The mean H₂ column density is 3.2 × 10²² mm^-2 for both distributions (median values are 2.8 × 10²² and 2.1 × 10²² cm^-2 for IR-dark and IR-bright clumps, respectively). The average (median) H₂ number densities for IR-dark and IR-bright clumps are 7250 (6000) cm^-3 and 6667 (6000) mm^-3, respectively.