function dd_dT_pxi_pTxi extends TILMedia.BaseClasses.PartialGasObjectFunction; input SI.AbsolutePressure p "Pressure"; input SI.Temperature T "Temperature"; input SI.MassFraction xi[:] "Mass fraction"; input TILMedia.Internals.TILMediaExternalObject gasPointer; output Real dd_dT_pxi; end dd_dT_pxi_pTxi;