Comparison of FWZI, M_out, Ṁ_out and F_CO obtained from CO J = 3−2 maps with L_bol, T_bol and M_env for the WILL (filled symbols) and WISH (open symbols) sources. The number of sources, correlation coefficient and probability that the correlation is not simply due to random distributions in the variables are shown in the upper-left of each panel. The grey dashed line in the panel for M_out vs. M_env indicates where M_out/M_env = 1%. The solid black lines show the relations found by Bontemps et al. (1996) between F_CO, L_bol and M_env for a sample of Class I sources. The dot-dashed black line shows the best-fit found between F_CO and L_bol by Cabrit & Bertout (1992) for a sample of Class 0 sources, while the dashed black line shows an extension to the low-mass regime of the fit to a sample of massive young sources from Maud et al. (2015).