Multi-line detection of O2 toward ρ Ophiuchi A R. Liseau, P. F. Goldsmith, B. Larsson, L. Pagani, P. Bergman, J. Le Bourlot, T. A. Bell, A. O. Benz, E. A. Bergin, P. Bjerkeli et al. (29 more) A&A, 541 (2012) A73 Published online: 01 May 2012 DOI: 10.1051/0004-6361/201118575