Molecular line emission images of the inner 120′′ (4.8 pc). From left to right: 13CS(2–1), N2H+(1–0), and CH3OH(8–7) at a resolution of 1.9′′× 1.6′′ (see Table 2). The contours at the levels [8, 16, 24, 32, 48, 64, 80, 96, 112] ×σ (=1.9 Jy beam-1 km s-1) show CN(2–1) emission of the CND at a resolution of 4.0′′× 2.6′′ for orientation (compare Fig. 1; CN data: Martín et al. 2012).
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