Correlation matrix of different observational (left) and derived physical (right) parameters of MCs. The observational parameters corresponding to indices 0 through 30 are (0) log V_span; (1) R₂, (2) θ, (3) e, and (4) log ﹩{l}_{{\rm{\max }},{\rm{ang}}}﹩ for ¹²CO; (5) R₂, (6) θ, (7) e, and (8) log l_maj,ang for ¹³CO; (9) R₂, (10) θ, (11) e, and (12) log l_maj,ang for C¹⁸O; (13–15) log σ_v(¹²CO, ¹³CO, C¹⁸O); (16–18) log ﹩\overline{W}﹩(¹²CO, ¹³CO, C¹⁸O); (19–21) log T_peak(¹²CO, ¹³CO, C¹⁸O); (22–24) log W_peak(¹²CO, ¹³CO, C¹⁸O); (25–27) log ﹩{\overline{T}}_{{\rm{peak}}}﹩(¹²CO, ¹³CO, C¹⁸O); and (28–30) log A(¹²CO, ¹³CO, C¹⁸O). The physical parameters corresponding to indices 0 through 36 are (0) R₂, (1) θ, (2) e, and (3) log l_maj for ¹²CO; (4) R₂, (5) θ, (6) e, and (7) log l_maj for ¹³CO; (8) R₂, (9) θ, (10) e, and (11) log l_maj for C¹⁸O; (12–14) log σ_v(¹²CO, ¹³CO, C¹⁸O); (15) D; (16) R_gal; (17) log z_gal; (18) log T_ex; (19–21) log τ(¹²CO, ¹³CO, C¹⁸O); (22–24) log ﹩N{({{\rm{H}}}_{2})}_{(12,13,18)}﹩; (25–27) log M_12,13,18; (28) log α_vir,12; (29) log α_vir,13; (30) log α_vir,18; (31–33) log Mach(¹²CO, ¹³CO, C¹⁸O); (34–35) log f(¹³CO, C¹⁸O); and (36) log X_CO.