Composition of dense matter for different physical regimes. Left (right) panel: composition of β-stable neutrino-free (trapped) nuclear matter, i.e., the particle fractions Y_i = n_i/n (with i = n, p, e⁻, μ⁻), in the case of an isoentropic EOS with S/A = 2. Right panel: we fix Y_le = 0.33. The dashed lines in the left panel represent the composition of the T = 0 BL EOS (Bombaci & Logoteta 2018) which is reported for comparison. See text for further details.