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Fig. 1

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OH (X 2Π; ν = 0) rotational lines detected with Herschel/PACS towards the α2000 ≃ 5h35m21.9s, δ2000 ≃  −5°25′06.7′′ position where the higher excitation OH line peak is observed (see Fig. 2). The red dotted lines show the expected wavelength for each Λ-doublet (see Fig. B.1 in Appendix B for a complete OH rotational energy diagram). Small intensity asymmetries are observed in most OH Λ-doublets. Transition upper level energies and Aij spontaneous transition probabilities are indicated.

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