The two-photon matrix elements Q s , Q v , and Q t defined in Eqs. (21-23), in atomic units (that is (ea 0) 2 /E h = 4πǫ 0 a 3 0) where a 0 is the Bohr radius and E h the Hartree energy), are given in the following Tables for L → L ′ = L − 2 (∆v = v − v ′ = 0, 1, 2, Tables I-III) , L → L ′ = L (∆v = 1, 2, Tables IV-V), and L → L ′ = L + 2 transitions (∆v = 1, 2, Tables VI-VII). It is worth noting that for L → L transitions, the rank 1 component Q v is comparatively small and may safely be ignored for calculating decay rates at the 4-digit accuracy level. TABLE I: Two-photon matrix elements Qt in atomic units, with L ′ = L − 2 and v ′ = v.