The physical conditions in IRDC clumps from Herschel/HIFI observations of H2O R. F. Shipman, F. F. S van der Tak, F. Wyrowski, F. Herpin and W. Frieswijk A&A, 570 (2014) A51 Published online: 15 October 2014 DOI: 10.1051/0004-6361/201423912