Common | 
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         Thermodynamic base properties on the phase boundary  | 
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         Derivatives required for inversion of density and temperature functions w.r.t. pressure and enthalpy states  | 
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         Record for coefficients of ideal term of Helmholtz equation of state  | 
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         Record for coefficients of residual term of Helmholtz equation of state  | 
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         Derivative of cubic spline  | 
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         Cubic spline  | 
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         Compute isochoric specific heat capacity inside the two-phase region  | 
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         Half-interval search algorithm  | 
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         Calculate phase boundary property record from dimensionless Helmholtz function  |