.TILMedia.BaseClasses.PartialGasObjectFunctions.der_speedOfSound_pTxi .TILMedia.BaseClasses.PartialGasObjectFunctions.der_speedOfSound_pTxipartial function der_speedOfSound_pTxi = TILMedia.BaseClasses.PartialGasObjectFunctionPrototypes.der_speedOfSound_pTxi;