.TILMedia.BaseClasses.PartialGasObjectFunctions.der_densityDerivativeWRTpressure_phxi .TILMedia.BaseClasses.PartialGasObjectFunctions.der_densityDerivativeWRTpressure_phxipartial function der_densityDerivativeWRTpressure_phxi = TILMedia.BaseClasses.PartialGasObjectFunctionPrototypes.der_densityDerivativeWRTpressure_phxi;