.TILMedia.BaseClasses.PartialVLEFluidObjectFunctions.densityDerivativeWRTpressure_psxi .TILMedia.BaseClasses.PartialVLEFluidObjectFunctions.densityDerivativeWRTpressure_psxipartial function densityDerivativeWRTpressure_psxi = TILMedia.BaseClasses.PartialVLEFluidObjectFunctionPrototypes.densityDerivativeWRTpressure_psxi;