Stellar mass vs. star formation rate (main sequence of star-forming galaxies). The filled circle and star represent the QSO host and the DSFG, respectively. We estimate the stellar mass using M_⋆ = (1 − f_gas) M_dyn with f_gas ≡ M_gas/M_dyn. When M_gas is calculated using the dust mass M_dust and a gas-to-dust ratio (GDR = 100) the markers are colored red. When the M_mol comes from Zanella et al. (2018) the markers are blue. For the case M_⋆ = 0.4 M_dyn (as done in Nguyen et al. 2020) the markers are green. For comparison, three MS curves for high-z sources are plotted: Speagle et al. (2014), Schreiber et al. (2015) and Tomczak et al. (2016).