Fig. S2.

Least squares fit for the inter- and intra-LL transitions (T_n and T₁*). Squares of T₁ (A), T₁*(B) and T_n (C–H) energies are plotted as a function of magnetic field. Symbols: experimental data. Blue curve: best fit from the first approach. Red curve: best fit from the second approach. For T_n (7 $\ge$ n $\ge$ 2), ${\chi }_1^2$ ∼ ${\chi }_2^2$ ∼ 0.999. For T₁, ${\chi }_1^2$ = 0.988 and ${\chi }_2^2$ ∼ 0.993. For T₁*, ${\chi }_1^2$ ∼ ${\chi }_2^2$ ∼ 0.940.