ALMA observations of water deuteration: a physical diagnostic of the formation of protostars S. S. Jensen, J. K. Jørgensen, L. E. Kristensen, K. Furuya, A. Coutens, E. F. van Dishoeck, D. Harsono and M. V. Persson A&A, 631 (2019) A25 Published online: 15 October 2019 DOI: 10.1051/0004-6361/201936012