Mass ejection rate and loading factor as a function of galaxy properties. Top: mass ejection rate as a function of star formation rate (left), star formation rate surface density (Σ_SFR, middle), and galaxy circular velocity (right, and stellar mass on top x-axis) for both surveys (MEGAFLOW and SIMPLE) as well as observations from B12, H15, M19, and P23. In the left panel, the dashed red line shows the prediction Ṁ_out ∝ SFR^0.7 from Hopkins et al. (2012) and the black line shows Ṁ_out ∝ SFR^1.11 observed by Arribas et al. (2014). The blue dotted line corresponds to a constant mass loading factor Ṁ_out/SFR of 2. Errors for Heckman et al. (2015) are 0.25 dex for Ṁ_out and 0.2 dex for SFR and Σ_SFR. Bottom: η as a function of SFR (left), Σ_SFR (middle), and S_0.5 (right) for both surveys (MEGAFLOW and SIMPLE) as well as observations from B12, H15, M19, and P23. In the left panel, the dashed red line shows the prediction η ∝ SFR^−0.3 from Hopkins et al. (2012) and the black line shows the fit η ∝ SFR^0.11 from Arribas et al. (2014). In the middle panel, the dashed red line shows the prediction $\eta \propto {\mathrm{\Sigma }}_{\mathrm{SFR}}^{-1/2}$ from Hopkins et al. (2012) and the black line shows the fit $\eta \propto {\mathrm{\Sigma }}_{\mathrm{SFR}}^{0.17}$ from Arribas et al. (2014). Again, errors for Heckman et al. (2015) are 0.2 dex for SFR (and Σ_SFR) and 0.45 dex for η. In the right panel, the dashed dotted black line shows η ∝ V⁻¹ and the solid black line shows η ∝ V⁻².