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Fig. 1

Black: HIFI spectrum showing the para-H2O ground-state absorption line for the line of sight towards G337.1. Green: FLASH CO(3−2) spectrum (1/50x, shifted by −0.09 K). Red: C17O(3−2) spectrum (1/16x, shifted by −0.11 K). The tangential velocity (± 10 km s-1, dashed) is indicated in blue.
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