Primary beam corrected CS J = 2 → 1 emission (Briggs weighting with a robustness parameter of 0.0) integrated over the velocity interval 585–612 km s−1, the near systemic velocity range, where nuclear absorption is not as strong as at adjacent velocities. Contours are 0.025, 0.05, 0.1, 0.2, 0.4, 0.6, and 0.8 times the integrated peak flux density of 2.48 Jy km s−1 beam−1. Overall, line absorption plays a lesser role than in Fig. 21. While the southern region of enhanced emission is part of the southeastern arm, the hotspot around 7″ farther to the east is (as in Fig. 21) a separate feature, possibly related to Knot B of Marconi et al. (2000; see our Sect. 4.1.3).
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