.TILMedia.BaseClasses.PartialGasObjectFunctions.densityDerivativeWRTmassFraction_phxin .TILMedia.BaseClasses.PartialGasObjectFunctions.densityDerivativeWRTmassFraction_phxinpartial function densityDerivativeWRTmassFraction_phxin = TILMedia.BaseClasses.PartialGasObjectFunctionPrototypes.densityDerivativeWRTmassFraction_phxin;