Outflow detection rate against the physical properties of clumps. Top left (a,b,c) to bottom right (d,e,f): detection rate as a function of clump mass M_clump (M_⊙), bolometric luminosity of the central object L_bol∕L_⊙, luminosity-to-mass ratio L_bol∕M_clump (L_⊙∕M_⊙), 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 clumps in logarithmic scales. The error bars on the x-axis and y-axis are determined following the same method in Fig. 6.