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The earliest phases of high-mass star formation are poorly understood.\n  Aims. Our goal is to determine the physical conditions and kinematic structure of massive star-forming cloud clumps.\n  Methods. We analyze H$_2$O 557 GHz line profiles observed with HIFI toward four positions in two infrared-dark cloud clumps . By comparison with ground-based C$^{17}$O, N$_2$H$^+$, CH$_3$OH and NH$_3$ line observations, we constrain the volume density and kinetic temperature of the gas and estimate the column density and abundance of H$_2$O and N$_2$H$^+$.\n  Results. The observed water lines are ","authors_text":"Fabrice Herpin, Floris F.S van der Tak, Friedrich Wyrowski, Russell F. 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