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\bibitem{Bruderer_etal2010} Bruderer, S., Benz, A. O., van Dishoeck, E. F., Melchior, M., Doty, S. D., van der Tak, F., et al. (2010). Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption. \textit{Astron. Astrophys.}, \textit{521}, L44 (1 to 7).

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