Redundant constants
Stefan-Boltzmann constant
:
https://git.ufz.de/mhm/mhm/blob/develop/src/mHM/mo_mhm_constants.f90#L37
is already defined here:
https://git.ufz.de/mhm/mhm/blob/develop/src/lib/mo_constants.f90#L106
The first one is not used ATM.