-> Starting from the given matrix, we can see that it is diagonal. This means that the axis that we chose was indeed the PAS. In addition, the (1,1) and (2,2) components are the same, so Vxx = Vyy and η = 0.
-> From the picture, we can see that the two electrons are along the z-axis. Axial symmetry means that we see the same thing, as we apply a rotation around that axis, which is the case here.