Hi! Thanks for your reply. I work with databases and I don’t need to correct anything, just thank you for devoting a bit of your time to my question!

Well said… Thanks for spelling it out!

Thanks for these pointers!! Will look into those.

I agree with this message: in fact I am not against doing it by hand. It could be a nice life project. I will look into all the advice that you have given me, thanks everyone!

Your last one is a good question. I don’t have an answer but I was leaning towards some sort of conservation law (e.g. normal stars have magnetic fields, when they get squeezed down to a neutron star those fields must go somewhere and it will be very much “concentrated”). Apparently this is a bit too easy (didn’t expect to be nothing different). Wikipedia provides a reference to a not too recent (2003) survey, namely this one: https://arxiv.org/abs/astro-ph/0307133 . I don’t know if it’s the state of the art but it surely is interesting.