a = Total number of basis functions of the basis set.
b1 = 1.285 eV, b2 = 1.659 eV, b4 = 1.625 eV, b51 = 1.791 eV, b52 = 1.614 eV,b53 = 2.156 eV, b6 = 1.806 eV, and b7 = 1.851 eV vertical excitation energies do not correspond to superatomic shells.