Thanks dear Amine
The problem I am facing with RGP file is that the solver diverges randomly even with time step as low as 1.0e-9 with errors mostly on 'fatal overflow in linear solver' and 'out of bound message for Cp'
It behaves well with Cubic equation of state and time step is also nice: 1.0e-7
That's why I wanted to know the parameter.
I am sorry I had to delete the post where I posted my mail id. I got a threat message from some hacker...