Visualization of adopted conventions for outflow velocity and outflow CO flux. v_out = |Δv|+FW_10%/2 (Eq. (1)) is derived from the shift of the broad Gaussian outflow component with respect to systemic velocity and its full width at a tenth of its peak. S​_CO (gauss) is the integral of this broad component. The flux in the wings of the broad component S​_CO (wings), indicated by the blue shaded area, integrates the broad component only over the velocity ranges for which it contributes at least 50% of the total flux density of the line.