function der_saturationMassFraction_pTxidg extends TILMedia.BaseClasses.PartialGasObjectFunction; input SI.AbsolutePressure p "Pressure"; input SI.Temperature T "Temperature"; input SI.MassFraction xi_dryGas[:] "Mass fraction of dry gas"; input TILMedia.Internals.TILMediaExternalObject gasPointer; input Real der_p "Pressure"; input Real der_T "Temperature"; input Real der_xi_dryGas[:] "Mass fraction of dry gas"; output Real der_xi_s "Saturation vapour mass fraction"; end der_saturationMassFraction_pTxidg;