Fig. 4
CO (4−3) and (2−1) images and F43/F21 ratio, integrated in 200 km s-1 bins. All panels were constructed directly from the data, and, unlike Fig. 3, they contain the disk emission. The image units, beam, FOV, and center are as in Fig. 3. Pixels with S/N< 3 have been masked. The contours in the last panel indicate where the CO(4 − 3) emission reaches S/N of 5, 10, and 20.
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