Yaws.HighIG: Cpo(Ideal Gas)

Cpo = å ai × T n(i) , where the summation is from i = 1 to 4.

Evaluation Results:
annotated evaluation results showing constant parameters (left to right): n_1, n_2, n_3, n_4 and fitted parameters (top to bottom): a_1, a_2, a_3, a_4