Common 
Thermodynamic base properties on the phase boundary 

Derivatives required for inversion of density and temperature functions w.r.t. pressure and enthalpy states 

Record for coefficients of ideal term of Helmholtz equation of state 

Record for coefficients of residual term of Helmholtz equation of state 

Derivative of cubic spline 

Cubic spline 

Compute isochoric specific heat capacity inside the twophase region 

Halfinterval search algorithm 

Calculate phase boundary property record from dimensionless Helmholtz function 