- [feat] Add option `leading_mass_splitting_3l_name` to class
`NueSurvivalProbability` that switches between `$|\Delta m^2_{32}|$` and
`$|\Delta m^2_{31}|$` inputs.
- [feat] Add option `leading_mass_splitting_3l_name` to class
`NueSurvivalProbability` that switches between `$|\Delta m^2_{32}|$` and
`$|\Delta m^2_{31}|$` inputs.