a) Blueshifted line wing as observed in four OH doublets at 119 (black histogram), 79 (green), 65 (red), and 84 μm (blue). The spectra are resampled to the velocity resolution of the OH119 spectrum. The velocity scale is relative to the blueshifted component of each doublet. b) Ratios of the absorption strengths (1 − Fν/FC). The vertical dotted line at −300 km s-1 marks the limit of the outflow region for the full set of lines.
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