Example of the flux-weighted nonparametric method. The solid blue line is the parametric fit to the [OIII]λ5007 Å emission line shown in Fig. 1 for J0924+01, without the continuum. The nonparametric velocity definitions included in this figure are the median velocity (v_med), the velocities at the 5, 10, 90, and 95% points of the normalized cumulative function of the emission line flux (v₀₅, v₁₀, v₉₀, and v₉₅), and the width of the line containing 80% of the total flux (W₈₀ = v₉₀ − v₁₀). The gray region corresponds to the area containing 80% of the total flux (i.e., between v₁₀ and v₉₀), and the blue and red regions correspond to high-velocity gas, which we consider to be outflowing.