Fig. 2
Top: OH absorption towards W49N. The velocities of the line-of-sight clouds and of W49N are indicated. The red dashed line is a least-squares fit. Middle: same for the OH absorption against W51e4. The relative positions and strengths of the hfc splitting are indicated for the υlsr = 7 km s-1 component. Bottom: OH absorption against G34.26+0.15.
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