Fig. S5.

Comparison of the two ways for defining the T₁ transition energy. (A) Split T₁ mode energies as a function of B and four olive dashed curves for fitting the inter-LL transitions T₁. The close-up image shows a royal blue dashed curve for fitting the low-field minimal position of T₁ and a green dashed curve representing the average energy of the four olive dashed lines. (B) Minimal positions of the dip features T₁ (royal blue dots) at B $\le$ 4 T.