Size assumption effect. Flux correction factor ratio between the assumed point source emission and a modelled galaxy profile as a function of effective radius. Each colored line shows the ratios for profiles with different Sérsic indexes. The black vertical dashed line represents a size reference of R_eff based on the stellar component size of QGs at z ∼ 1.5 with log(M_*/M_⊙) = 10.7 (van der Wel et al. 2014).