Left: following Abril-Melgarejo et al. (2021), we show the S/N of the total [O II] flux as a function of the resolved ratio (R_e, hst/PSF FWHM) for the sample of SFGs. The gray bands represent the selection of resolved galaxies in Abril-Melgarejo et al. (2021), consisting of S/N > 30 and R_e, hst/FWHM > 0.5. Right: comparison between the total [O II] S/N and the effective S/N (Eq. (6)), color-coded with R_e. In both panels, the red points are galaxies with S/N_eff < 3.0, while the blue points correspond to galasxes with S/N_eff > 3.0.