Observations of spatial and velocity structure in the Orion molecular cloud H. D. Nissen, M. Gustafsson, J. L. Lemaire, Y. Clénet, D. Rouan and D. Field A&A, 466 3 (2007) 949-968 Published online: 24 April 2007 DOI: 10.1051/0004-6361:20054304