Correlation plots for (a) F_CO and M_env, (b) F_CO and L_bol, and (c) M_env and L_bol adapted from vdM13. Diamonds show their study, triangles the study of Cabrit & Bertout (1992) and filled circles that of Hogerheijde et al. (1996). The Class 0 protostars are encircled. The dashed lines indicate their best fit. The results for Cha-MMS1, GF 9–2 (Furuya et al. 2019), B1b-N, and B1b-S (Gerin et al. 2015) are shown in red, green, blue, and orange, respectively. The error bars on the total momentum force of the outflows represent the uncertainty on the inclination correction adapted from Cabrit & Bertout (1992). The error bars on the luminosity and the mass of Cha-MMS1 correspond to the range derived by Tsitali et al. (2013) and an uncertainty of a factor of 2 (Belloche et al. 2011), respectively. The results for Cha-MMS1 correspond to the optical depth case τ₁₂ = 5.