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Fig. 4


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.

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