Helmholtz function for region 3: f(d,T)
function f3 extends Modelica.Icons.Function; input SI.Density d "Density"; input SI.Temperature T "Temperature (K)"; output ThermofluidStream.Media.myMedia.Common.HelmholtzDerivs f "Dimensionless Helmholtz function and derivatives w.r.t. delta and tau"; end f3;