The _fit_HoRT method in empirical.nasa incorrectly used the Nasa low and high coefficients when computing the NASA a6 coefficient resulting in an incorrect a6 coefficient when T_ref is greater than T_mid. The function needs to be rewritten to provide two cases: when T_ref is below T_mid and when T_ref is above T_mid.
Version of pMuTT v1.4.3
The _fit_HoRT method in empirical.nasa incorrectly used the Nasa low and high coefficients when computing the NASA a6 coefficient resulting in an incorrect a6 coefficient when T_ref is greater than T_mid. The function needs to be rewritten to provide two cases: when T_ref is below T_mid and when T_ref is above T_mid.