CO channel maps computed by integrating the CO(1–0) emission in channels of Δv = 42 km s⁻¹, showing the comparison between data and BBarolo best-fit disk model within the Big region around NED01. In each of the three panels, the top row (blue contours) displays the data, the central row the model (red contours), and the bottom row the residual emission (green contours). The contours are plotted at 3, 6, 9, 15, 20, 30, 40, 50σ. Symmetric negative contours are plotted in grey. The yellow cross indicates the centre of the disk model.