function density_derX_ph_phX input Modelica.SIunits.AbsolutePressure p "pressure"; input Modelica.SIunits.SpecificEnthalpy h "specific enthalpy"; input Modelica.SIunits.MassFraction X[nC] = reference_X "Mass fraction"; input Properties state; input MultiPhaseMixture.Templates.ExternalObjects.ExternalMediaObject eo "External object"; output Real dddX_ph[nC] "Density derivative wrt X at constant pressure and enthalpy"; end density_derX_ph_phX;