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Fig. A.1


Comparison of high-resolution 12CO 21 observations with the SMA (black contours, König et al. 2013) to the ALMA 13CO 10 emission presented in this work (color scale). Note how the 13CO 10 emission peaks exactly at the location of the connection between the molecular ring and the dust lane (grey contours, see also Figs. 1a & 3 in König et al. 2013). The 12CO 21 contours start at 4σ and are spaced in steps of 4σ (1σ = 6.16 mJy beam-1). North is up, east to the left, and the beams are shown in the lower right corner of the image. The cross marks the position of the phase center of the observations.

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