Left panel: cuts through EOS table showing T(e_int) for fixed ρ values. The solid line indicates densities corresponding to 600 km and dashed line indicates densities corresponding to 1100 km. The vertical solid and dashed thin lines indicate the values of e_int corresponding to 600 and 1100 km. The vertical solid and dashed thick lines represent e_int + η_AJ², taking the same value for η_AJ² = 10⁷, as per Fig. 10. Right panel: same but for the gradient dT/de_int.