Channel maps of ¹²CO (left) and ¹³CO (right). Boxes indicate channels of “missing” ¹³CO emission compared to ¹²CO. The ¹²CO map has been smoothed to the same resolution as ¹³CO. Intensity levels for ¹²CO and ¹³CO are same fraction of peak: 35% (–1.5, –1, 1.5, 2, 2.5) – where the peak is 360 and 25 mJy beam-1 for the ¹²CO and ¹³CO respectively. Note that for ¹²CO a big fraction of the detected, extended flux is not shown due to the cut-off. The comparative channels maps show the position of the peak emission for ¹²CO and ¹³CO. The velocity in panel 18 = 2714 kms^-1, panel 14 is 2538 kms^-1, and panel 10 = 2362 kms^-1. Increment between panels is 44 kms^-1. Crosses indicate the 1.4 GHz radio continuum position. The beam is marked in the upper right corner of the first panel for the ¹²CO and ¹³CO channel maps. Greyscale for the ¹²CO map ranges from 50 to 400 mJy beam^-1 and for ¹²CO from 7.5 to 26 mJy beam^-1. For the ¹³CO map the first contour corresponds to 2.5σ.