partial function criticalSurfaceTension_xi extends TILMedia.BaseClasses.PartialVLEFluidObjectFunction; input SI.MassFraction[:] xi "Mass fractions of the first nc-1 components"; input TILMedia.Internals.TILMediaExternalObject vleFluidPointer; output SI.SurfaceTension sigmac "Critical surface tension"; end criticalSurfaceTension_xi;