voigt
Work on the Voigt approximation:
- new module called module_voigt.f90, with its own parameters under the section [voigt]
- the function voigt_fit was renamed voigt_function
- voigt_function now returns the H(x,a) function (and not H/
\sqrt{\pi}
) - 3 different approximations implemented, namely 'COLT', 'Humlicek_w4', and 'Tasitsiomi'
- user-defined parameter "approximation" to choose one of these approximations