Spatial extent of the average [CII] emission. Top: Channel maps of the stacked cube covering ∼2000 km s⁻¹ around the peak of the emission line. Velocity bins are in steps of ∼106 km s⁻¹ for a better representation. Each spectral channel shows the [CII] emission from a 80″ × 80″ region. Contour levels are shown in white at 3, 5, and 7σ, where σ is the rms computed in each channel. Bottom: [CII] integrated intensity maps of the outflow and core emission. Left and right panels are obtained by summing the emission of the broad wings in the velocity ranges [−500, −250] and [250; 500] km s⁻¹, respectively, while the central panel represents the core emission at [−250; 250] km s⁻¹. The bottom panel is the sum of the two velocity-integrated maps of the broad wings (as pointed out by the arrows) representing the whole outflow emission. Contour levels are shown in white at 3, 5, and 7 σ, where σ is the rms of the integrated intensity map. Both figures report the PACS beam (as shown in the lower-left corner of the first panel) and a reference scale of 5 kpc.