tokens: Acknowledgements The authors wish to thank Nathan Crockett for providing the data on Orion KL and Sgr B2, and Peter Schilke for the data on NGC6334I. We also thank Frederik Dhooghe for discussing his results on halogens in 67P/C–G and David Neufeld and Catherine Walsh for discussions on the chemistry. MK is supported by an Intra-European Marie Sklodowska-Curie Fellowship. Astrochemistry in Leiden is supported by the Netherlands Research School for Astronomy (NOVA), by a Royal NetherlandsAcademy of Arts and Sciences (KNAW) professor prize, and by the European Union A-ERC grant 291141 CHEMPLAN. HIFI has been designed and built by a consortium of institutes and university departments from across Europe, Canada andthe United States under the leadership of SRON Netherlands Institute for Space Research, Groningen, The Netherlands and with major contributions from Germany, France and the US. Consortium members are: Canada: CSA, U.Waterloo; France: CESR, LAB, LERMA, IRAM; Germany: KOSMA, MPIfR, MPS; Ireland, NUI Maynooth; Italy: ASI, IFSI-INAF, Osservatorio Astrofisico di Arcetri-INAF; Netherlands: SRON, TUD; Poland: CAMK, CBK; Spain: Observatorio Astronómico Nacional (IGN), Centro de Astrobiología (CSIC-INTA). Sweden: Chalmers University of Technology - MC2, RSS GARD; Onsala Space Observatory; Swedish National Space Board, Stockholm University - Stockholm Observatory; Switzerland: ETH Zurich, FHNW; USA: Caltech, JPL, NHSC.
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