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Thermodynamic properties of the H20 component in molten silicate liquids are modeled following the method of Nicholls (1980; Ghiorso et al. 1983). We adopt his value for the reference state entropy (152.63 J/mol-K) and optimize a value of the reference enthalpy (-279.992 kJ/mol) to satisfy best the experimental data on water solubility discussed above. We modify Nicholls' (1980) function for the volume integral contribution to the molar Gibbs energy of dissolved H20 by subtracting the Gibbs energy of supercritical water tabulated by Robie et al. (1978) and adding the identical quantity from Berman (1988, see previous paragraphs). This insures the thermodynamic properties of the H20 component of Table AI are internally consistent with those of the supercritical fluid.