Fig. 3
Comparison between the input data and the analytical fitted isotherms for the pressure P (panel a) and for the internal energy U (panel b) atrelatively low densities. Symbols show the data: the IAPWS (Wagner & Pruß 2002) published table for P < 1 GPa (straight crosses) and extension to P > 1 GPa according to the IAPWS free-energy model (squares); results of ab initio calculations by Soubiran & Militzer (2015; empty diamonds) and by French et al. (2009; oblique crosses for liquid, inverted triangles for ice X, filled diamonds for the superionic [SI] phase). Solid lines represent the present fit; dotted lines represent the fit of French & Redmer (2015) for ice X.
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