Cumulative distributions of the physical properties for the total 4120 clumps and the selected 2052 clumps. Top left (a,b,c) to bottom right (d,e,f): cumulative distributions of clump mass M_clump [M_⊙], bolometric luminosity of central objects L_bol [L_⊙], heliocentric distance Dist. (kpc), the peak H₂ column density (peak N(H₂) cm⁻²), the mean mass surface density Σ (M_⊙ pc⁻²), and the mean volume H₂ density n(H₂) (cm⁻³) of the total 4120 clumps (orange lines) and the selected 2052 clumps (black lines). The orange and black vertical lines show the median values of the two samples for each parameter.