Molecular line emission images of the inner 20′′ (as in Fig. 5) compared to the CS(5–4) emission in contours (as in Fig. 5). Top row (from left to right): HC3N(27–26), H13CO+(3–2), SiO(6–5), and SO(7–6). Bottom row (from left to right): C2H(3–2), CH3OH(7–6), and two times SiO(8–7). The image at the bottom right corner shows SiO(6–5) contours at [2, 4, 8, 12, 16]× σ (= 0.08 Jy beam-1 km s-1) for comparison.
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