Integrated intensity maps of 12CO (1–0) (a), 12CO (2–1) (b), and 12CO (3–2) (c). All of their integrated velocity ranges extend from −20.5 to −12.5 km s−1. The red dashed line represents the PV cut, and its corresponding PV diagrams are shown in Fig. 9. In each panel, the two pentagrams represent the two maser positions discussed in Sect. 3.3. The beam size is shown in the lower right corner of each panel.
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