Fig. 1

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Integrated intensity NH3 (1,1) and (2,2). The beam and scale bar are shown in the bottom left and the bottom right corners, respectively. The green contours show 15σ, 30σ, and 45σ levels for the (1,1) map and 3σ, 5σ, and 10σ levels for the (2,2) map. The root-mean-square noise levels are 0.08 K km s−1 and 0.06 K km s−1 for NH3 (1,1) and (2,2), respectively.
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