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). The contours at the levels of [6, 12, 24, 48, 96, 144, 192, 384, 1920, 4800] × σ (=0.5 mJy beam-1) show the 100 GHz continuum emission.
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