Stellar evolution tracks in the g − T_eff diagram for the labelled masses. The region enclosed by the thick black boundary is the g − T_eff range covered by the RHD simulations. Thick solid lines denote fully consistent calculations with the RHD calibrated variable α_ml and T(τ) relationships. The lower panel displays the evolution of α_ml along each track. The dotted portion of each sequence denotes the region where the α_ml values are extrapolated. Dashed lines in the upper panel represent tracks calculated with a constant α_ml = α_{ml, ⊙} and the RHD T(τ) relationships.