Comparison of the outflow velocities of OH and CO. Upper row: v₉₈ derived from the OH absorption profile compared with the mean (v_out(b), left) and maximum (v_max(b), right) velocities of the CO blue-shifted wing. The background colours highlight the three regions described in Sect. 5.4: (i) targets with v₉₈ similar to v_max(b), (ii) targets with v₉₈ > v_max(b), and (iii) targets v₈₄ < v_max(b). Lower row: v₉₈ derived from the OH emission profile compared with the mean (v_out(r), left) and maximum (v_max(r), right) velocities of the CO red-shifted wing. The blue lines mark the outflow detection threshold of |v|> 300 km s⁻¹. Black circles mark targets classified as compact obscured nuclei (CONs). Colour-code as in Fig. 1.