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Le Bouquin, J. Dexter, J. Kolb, J. Panduro, J.P. Berger, J. Ramos, J. Sanchez-Bermudez, J. Woillez, K. Perraut, L. Jochum, L. Jocou, M. Haug, M. Horrobin, M. Kulas, M. Lippa, M. Sch\\\"oller, M. Wiest, M. Wittkowski, N. Anugu, N. Blind, O. Pfuhl, P. Garcia, P. Kervella, P. L\\`ena, R. Abuter, R. Garcia Lopez, R. Genzel, R.-R. Rohloff, S. Gillessen, S. Hippler, S. Lacour, S. Scheithauer, S. Yazici, Th. Henning, T. Ott, T. Paumard, W. Brandner, W. de Wit, X. Haubois, Y. Cl\\'enet, Y. Kok, Z. Hubert","submitted_at":"2017-05-05T18:32:29Z","abstract_excerpt":"We present the first optical observation at sub-milliarcsecond (mas) scale of the microquasar SS 433 obtained with the GRAVITY instrument on the VLT interferometer. The 3.5 hour exposure reveals a rich K-band spectrum dominated by hydrogen Br$\\gamma\\ $ and \\ion{He}{i} lines, as well as (red-shifted) emission lines coming from the jets. 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