Relation of outflow properties to far-infrared surface brightness. The AGN contribution to the bolometric luminosity is color-coded on a square-root scale between zero (dark blue) and one (dark red). Black symbols in the left panels, plotted at an arbitrary low value, refer to sources lacking an outflow detection (upper limits in the right panels). High far-infrared surface brightness sources from Table 1 of Lutz et al. (2016) are at log(Σ_FIR) ≳ 11.75 L_⊙ kpc⁻² (vertical dotted lines). Carbon monoxide observations are close to complete here (17/18), unlike the incomplete literature results for lower surface brightness.