a) UV heated gas mass is shown as a function of envelope mass (M_env), b) density at 1000 AU (n_H (1000 AU)), and c) the outflow mass calculated from the ¹²CO 6−5 lines for the same region (M_{obs(¹²CO 6−5)}). d) The fraction of the UV heated gas mass over envelope mass as a function of bolometric luminosity (L_bol). Figure 10d has the same y-axis values as a)−c).