Mechanisms (top panel) and the density (bottom panel) for the transition to homogeneous matter as a function of temperature and proton number. The color legend in the top panel is as follows. Mechanism I (blue): n_tr is taken as n_B where V_cl(n) reaches the maximum for fixed values of T and Y_p; mechanism II (green): n_tr corresponds to the lowest value of n_B where V_cl/V ≥ 0.9; mechanism III (cyan): n_tr corresponds to the lowest value of n_B where f_inhomo/f_homo − 1 ≥ −10⁻⁶. Cases where the transition is considered to occur at the highest density where convergence of Eqs. (43) and (44) is reached are marked in red. In the bottom panel the color levels correspond to n_tr in units of fm⁻³. The considered interaction is BBSk1.