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Fig. 2

Observed line shapes of the transitions J = 16 − 15 (dotted purple) and J = 10 − 9 (solid red) of 12CO, J = 14 − 13 of 28SiO (long-dashed green), and 11,0-00,1 of ortho-HO (short-dashed blue). The vertical line marks the adopted υLSR = 40.4 km s-1.
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