Metallicity vs. SFR for the eight groups of galaxies, color-coded by stellar mass. We show the lines of constant Balmer attenuation generated from our dust model (Equation (8), adopting a = 2.15, n = 1.4 and leaving R _sf free). Additionally, we display the shaded regions of the FMR from Sanders et al. (2021), which correspond to the mean masses of the low- and high-mass groups. The groups appear to fall near the lines of constant attenuation despite their differing metallicities and SFRs. The slope of constant Balmer attenuation appears to be very similar to the slope of the FMR at fixed mass, so galaxies of similar mass will have a similar Balmer attenuation, regardless of their SFR or their corresponding metallicity.