T_b−T_s relations for different densities, ρ_b (see annotated coloured text, in g cm⁻³), and three magnetic field strengths (see titles) for the Fe envelope. The band corresponds to different values of the magnetic angle, Θ (lower values of T_s for the same T_b correspond to larger angles, i.e. more magnetic insulation). Using the same colours, we show all the points (circles) in the training dataset that correspond to similar magnetic field strengths and densities (difference smaller than 0.05 dex), demonstrating the success of the model in learning the T_b−T_s relation. The relations obtained by Gudmundsson et al. (1983) (dotted black line) and Potekhin et al. (2015) (hatched band) for ρ_b=10¹⁰ g cm⁻³ are also plotted for comparison.