Inverse iteration in region 1,2 and 5: p = g(d,T)
function pofdt125 extends Modelica.Icons.Function; input SI.Density d "Density"; input SI.Temperature T "Temperature (K)"; input SI.Pressure reldd "Relative iteration accuracy of density"; input Integer region "Region in IAPWS/IF97 in which inverse should be calculated"; output SI.Pressure p "Pressure"; output Integer error "Error flag: iteration failed if different from 0"; end pofdt125;