Panels 1 and 2: HC18O+ spectra at the two positions IF and MP2. Panels 3 and 4: H13CO+ spectra at the two positions IF and MP2. The blue dashed line shows the velocity of 10 km s-1, relative to the frequencies 85.162, 255.480, 86.745, and 260.255 GHz, from top to bottom.
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