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Fig. A.2


Overlay of the 13CO 10 emission observed with ALMA (gray contours) on top of the 12CO 10 emission observed with ALMA (color scale). Note how the bulk of the 13CO 10 emission is located outside the dust lane to the west of the nucleus (white contours). Moreover, the 13CO 10 located in the dust lane does not cover its full extent. The 13CO 10 contours are the same as in Fig. 3b. 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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