CHAMP+ observations of warm gas in M 17 SW J. P. Pérez-Beaupuits, M. Spaans, M. R. Hogerheijde, R. Güsten, A. Baryshev and W. Boland A&A, 510 (2010) A87 Published online: 16 February 2010 DOI: 10.1051/0004-6361/200913077