Spectra of HO lines toward the high-mass star-forming region AFGL 2591. Dashed red lines are drawn at the source velocity VLSR = −5.5 km s-1. Green lines present the outflow components. We note that the H2O 212−101 and 221−212 lines occur in opposite sidebands of the same spectrum, causing the features near 20 km s-1.
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