Proper motions of molecular hydrogen outflows in the ρ Ophiuchi molecular cloud M. Zhang, W. Brandner, H. Wang, M. Gennaro, A. Bik, Th. Henning, R. Gredel, M. Smith and Th. Stanke A&A, 553 (2013) A41 Published online: 26 April 2013 DOI: 10.1051/0004-6361/201220342