Return liquid and gas densities at give temperature and pressure, by EOS, bellow the critical temperature
pure function dhsFrom_pT input AbsolutePressure p; input Temperature T; input String var; output Density ld; output SpecificEnthalpy lh; output SpecificEntropy ls; output Density gd; output SpecificEnthalpy gh; output SpecificEntropy gs; end dhsFrom_pT;