Left: CO(2–1) spectrum (with continuum) of 07251-0248 E, showing an absorption at velocities v = [ − 320, −500] km s⁻¹. Middle: Emission of the blue- and red-shifted high-velocity channels of 07251-0248 E, shown with blue and red contours, respectively. The lowest contour corresponds to the 3σ level. The next contour levels are (0.5, 0.7, 0.9) of the peak of the emission. Dashed lines indicate negative contour levels ([-3, -4, -5, -6, -7]×σ). The dashed black circle shows the size of the outflow (R_out) and the grey cross the central position of the outflow. The black and green crosses shows the position of the continuum peaks of the E and W nuclei, respectively. Right: CO(2–1) spectrum (with continuum) of 13451+1232 W. No clear absorption is detected in this spectrum at the velocities of the an absorption detected in the CO(3–2) spectrum by Dasyra & Combes (2012) at v = [ − 700, −1200] km s⁻¹ (see orange shaded region).