The modulus squared (times r 2 2 sin ϑ 2 ) of the conditional amplitude [Eq. (37b)] is plotted in Fig. as a function of the coordinates of the remaining electron r 2 and ϑ 2 , with ϕ 2 fixed at π rad. The reference electron is placed at polar angle ϑ = π/2 and azimuthal angle ϕ = π, while the radial distance is varied from r = 0.1 bohr in the left panel to 20.0 bohr in the right panel, passing through r = 2.5 bohr in the center panel. The modulus squared of the conditional amplitude represents the probability density of finding the remaining electron in a certain region of space, depending on where the reference electron is placed.