Toward gas exhaustion in the W51 high-mass protoclusters A. Ginsburg, W. M. Goss, C. Goddi, R. Galván-Madrid, J. E. Dale, J. Bally, C. D. Battersby, A. Youngblood, R. Sankrit, R. Smith et al. (3 more) A&A, 595 (2016) A27 Published online: 25 October 2016 DOI: 10.1051/0004-6361/201628318