Nuclear spectra of 3C 015 and 3C 445. Left panel: observed [O III] emission line is shown (in blue) with the mirror image of the redshifted line (in black). Their difference (in red) reveals a blueshifted wing in the profile, with ionized gas that reaches high negative velocities. We masked the central region of the [O III] profile – at one-third of the maximum height of the emission line (grey region) – not considering the gas in ordered rotation. We measured the median velocity (v₅₀) of the outflow measured on the blue-wing residual component.