.TILMedia.BaseClasses.PartialGasObjectFunctions.der_humidityRatio_xi .TILMedia.BaseClasses.PartialGasObjectFunctions.der_humidityRatio_xipartial function der_humidityRatio_xi = TILMedia.BaseClasses.PartialGasObjectFunctionPrototypes.der_humidityRatio_xi;