Herschel/PACS spectrum of Mrk 231 around the 9 OH doublets, with the adopted baselines (dashed lines). The velocity scale is relative to the blue Λ-component of each doublet and has been calculated with respect to the systemic redshift of z = 0.04218. Potential contaminations due to other species are indicated in blue (and are discussed in the text). In panel b), the black and dark-blue OH79 spectra correspond to GT observations, while the light-blue spectrum corresponds to OT2 observations (see Table 1). In panel d), the OH65 spectrum corresponds to the average of the three brightest spaxels of the GT observations (GT-avg in Fig. 5).
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