where ℓ is the azimuthal quantum number that ranges from 0 to n −1. The angle functions depend on k and on a quantum number m which ranges from − j to j by steps of 1. The states are labeled using the letters S, P, D, F et cetera to stand for states with ℓ equal to 0, 1, 2, 3 et cetera (see azimuthal quantum number), with a subscript giving j. For instance, the states for n =4 are given in the following table (these would be prefaced by n, for example 4S 1/2):