Comparison between the CO profile at the location of the northern lobe (from the lower-resolution cube) and the H I absorption profile from Vermeulen et al. (2003). This illustrates the similarity of the velocity widths between the CO emission and the H I absorption. The scales on the y-axis of the two plots are different. The regions marked in grey in the H I plots were affected by radio frequency interference (see Vermeulen et al. 2003 for the full discussion).