Energy level diagram of OH showing the transitions detected in Mrk 231 with Herschel/PACS and Spizer/IRS with blue and green arrows, respectively. The l-doubling splitting of the levels is not indicated. Colored numbers indicate rounded wavelengths in μm. The Π1/2 J = 5/2−3/2 (black line) and the Π1/2−Π3/2 J = 3/2−5/2 doublets at λrest ≈ 99 and 96 μm (the latter detected in NGC 4418, G-A12) were not observed, as they are redshifted into the PACS gap at 100 μm. In the text, we denote a doublet by giving its wavelength (e.g. OH119).
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