Comparison of log(L/L_⊙) versus A(Li) in NGC 2158, NGC 2141, Be 21, Trumpler 5, NGC 2243, and Be 32: symbols and colours are the same as for the observations as in Fig. 3. The orange continuous curves are the MESA models with thermohaline mixing for the masses indicated in each panel, and μ₁₂ = 0. The dotted curves are the models with NMM mixing of Mori et al. (2021) for 1 M_⊙ and different μ₁₂, from 1 to 5, from right to left.