.TILMedia.BaseClasses.PartialVLEFluidObjectFunctions.densityDerivativeWRTpressure_phxi .TILMedia.BaseClasses.PartialVLEFluidObjectFunctions.densityDerivativeWRTpressure_phxipartial function densityDerivativeWRTpressure_phxi = TILMedia.BaseClasses.PartialVLEFluidObjectFunctionPrototypes.densityDerivativeWRTpressure_phxi;