.TILMedia.BaseClasses.PartialGasObjectFunctions.der_densityDerivativeWRTmassFraction_phxin .TILMedia.BaseClasses.PartialGasObjectFunctions.der_densityDerivativeWRTmassFraction_phxinpartial function der_densityDerivativeWRTmassFraction_phxin = TILMedia.BaseClasses.PartialGasObjectFunctionPrototypes.der_densityDerivativeWRTmassFraction_phxin;