Line profiles of the individual J = 77–66 (left) and J = 78–67 (right) transitions extracted from within the 3σ extent of their respective intensity maps. Both line profiles reach a S/N of 3 with rms noise of 10.8 and 8.7 mJy, respectively. Highlighted in red and blue are the velocity ranges of emission used in the moment maps in Fig. 4.
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