English: Graph showing the Zeeman splitting in Rb-87, the energy levels of the 5s orbitals, including fine structure and hyperfine structure. Here, the quantum number F = J + I, where I is the nuclear spin. (for Rb-87, I = 3/2). The original splitting is due to zero-field fine structure + hyperfine splitting. Graph was produced in MATLAB by plotting the Breit-Rabi equation. The code can be viewed here: https://github.com/delton137/Breit_Rabi_Zeeman_Plotter