I have a couple of questions about this chapter (I thought I’d post them here). I have put 2 of them in my answer to the tasks of the miscellaneous topics question. So my first is that something goes wrong with the calculation of the shift in the energy levels for the EFG contribution and I don’t see my mistake. The second question is about the second part, very general, how we are supposed to get information on the PAS for the magnetic interaction. I thought we’d have to work with the magnetic and chemical symmetry but was unable to deduce information on the PAS. Besides that I have a very general question, what is the importance of the PAS, it is not clear to me yet.