Difference in the inferred abundances when switching off the specified ingredients in the non-LTE model atom: from left to right, fine structure; excitation of N I via electron collisions (Eq. (1)); ionisation of N I via electron collisions (Eq. (2)); excitation of N I via hydrogen collisions (Eq. (3)); charge transfer of N I via hydrogen collisions (Eq. (4); and ionisation of N I via hydrogen collisions (Eq. (5)). These results are based on the standard non-LTE model atom, and using the 1D model solar atmosphere.