If you use any of the programs linked on this page in a scientific publication, please refer to the following papers:

van Hoof P.A.M., Williams R.J.R., Volk K., Chatzikos M., Ferland G.J., Lykins M., Porter R.L., Wang Y.
Accurate determination of the free-free Gaunt factor, I -- non-relativistic Gaunt factors
2014, MNRAS, 444, 420

van Hoof P.A.M., Ferland G.J., Williams R.J.R., Volk K., Chatzikos M., Lykins M., Porter R.L.
Accurate determination of the free-free Gaunt factor, II -- relativistic Gaunt factors
2015, MNRAS, 449, 2112

The source code used to generate the tables of non-relativistic Gaunt factors linked on the data page can be found in this tarball. Instructions for compiling and running the code can be found in the README file.

The programs used to generate the tables of relativistic Gaunt factors linked on the data page can be found in this tarball. Instructions for compiling and running the code can be found in the README file.

These programs are distributed under the GNU GPL v3 license.

Peter A.M. van Hoof
Royal Observatory of Belgium
Ringlaan 3
B-1180 Brussels
Belgium
p (dot) vanhoof (at) oma (dot) be