Residual CO(1–0) emission in NED02 after subtracting the best-fit rotating disk model computed by BBarolo. Left: Map of the CO(1–0) residual emission integrated within v ∈ [ − 170, 20] km s⁻¹. Contours are plotted at 3, 6, 9, 15, and 20σ. The black cross indicates the dynamic centre of the rotating disk and the blue cross shows the centroid of the residual emission. The residual structure can be enclosed within a box of 8″ × 8″ (∼3 kpc, see black box overlayed on the map). Centre: Spectrum of the CO(1–0) residual emission in NED02, extracted from the squared aperture shown in the left panel. The results of the spectral fitting with Gaussian functions are given in Table 5. Right: Map of the two blueshifted spectral components visible in the residual spectrum shown in the central panel. The first component, integrated within v ∈ [ − 350, −120] km s⁻¹, is displayed using blue contours. The second component, integrated within v ∈ [ − 120, 0] km s⁻¹ is shown in black. Contours are plotted at 3, 6, 9, 15, and 20σ.