.TILMedia.Internals.GasConfigurations.AnalyticDerivatives.GasObjectFunctions.speedOfSound_phxi .TILMedia.Internals.GasConfigurations.AnalyticDerivatives.GasObjectFunctions.speedOfSound_phxifunction speedOfSound_phxi = TILMedia.Internals.GasObjectFunctions.speedOfSound_phxi;