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Fig. 1

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Integrated velocity contours of the 13CO emission every 1.0 km s-1 superimposed on the GLIMPSE 8.0 μm grayscale. The contours are at multiples of the 13% level of each of the emission peaks. The peak of each mosaic from −62 to −43 km s-1 is 0.718, 1.632, 3.584, 7.503, 9.191, 11.388, 14.901, 16.428, 10.915, 9.673, 12.091, 15.416, 16.916, 16.467, 14.378, 12.772, 6.043, 3.018, 1.535, and 2.631 K km s-1, respectively. The green symbols “▴”, “■” and “★” indicate the positions of the water maser, the methanol maser, and IRAS 16158-5055, respectively.

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