Interior T − ρ profiles in the hydrogen phase diagram for different astrophysical bodies at about 5 Gyr, as labelled in the figure (red lines), and for a 0.075 M_⊙ object at 10⁸, 8 × 10⁸ and 8 × 10⁹ yr (blue dotted, short-dashed and long-dashed lines, respectively). The SCvH, CP, and QMD labels stand for Saumon et al. (1995) EOS, Chabrier & Potekhin (1998) EOS, and QMD simulations. The line f_WK correponds to the onset of quantum (diffration) effects on the ions while Γ_m delineates the hydrogen melting line (see Chabrier et al. 2019 and Chabrier & Debras 2021 for details).