.TILMedia.BaseClasses.PartialVLEFluidObjectFunctions.der_density_pTxi .TILMedia.BaseClasses.PartialVLEFluidObjectFunctions.der_density_pTxipartial function der_density_pTxi = TILMedia.BaseClasses.PartialVLEFluidObjectFunctionPrototypes.der_density_pTxi;