Comparison of the mass-loss rates from all the galaxies studied: the LMC (blue circles), SMC (orange crosses), MW (black squares), and NGC 6822 (green triangles). The red points denote mass-loss rates derived from gas diagnostics. The solid lines show the prescription from Beasor et al. (2020) for initial masses of 10 and 20 M_⊙, and the dash-dotted line is the relation from de Jager et al. (1988). The transparent symbols for MW and NGC 6822 indicate uncertain results. The shaded region includes stars with log(L/L_⊙) < 4, which are less likely RSGs.