Top: luminosity maps of the high-velocity [CII] emission derived from the stacked cube of the ≳0.6 arcsec sample, after having applied a tapering to a common 1.2 arcsec resolution. From left to right panels: emission at increasing absolute velocities, specifically |v| > 400 km s⁻¹, |v| > 550 km s⁻¹ and |v| > 700 km s⁻¹. Maps were obtained by summing the emission at > 3σ in 80 km s⁻¹ channel maps for at least three channels (i.e. ≳250 km s⁻¹). The 1.2 arcsec beam is also indicated in the first map (solid line). The thick solid contour encloses the region from which 50% of arises. Bottom: signal-to-noise maps associated with the different velocity bins.