In-orbit performance of Herschel-HIFI P. R. Roelfsema, F. P. Helmich, D. Teyssier, V. Ossenkopf, P. Morris, M. Olberg, R. Shipman, C. Risacher, M. Akyilmaz, R. Assendorp et al. (89 more) A&A, 537 (2012) A17 Published online: 20 December 2011 DOI: 10.1051/0004-6361/201015120