Ratio of the mass fractions of the clusters and of the gas (top panels) with (Y_i(w)) and without (Y_i(wo)) the tetraneutron, for a fixed proton fraction of y_p = 0.3 (left) and y_p = 0.1 (right), in a calculation where we consider a fixed binding energy for the 4n, taken as B₀(4n) = − 2.37 MeV. In the bottom panels, the chemical equilibrium constants, K_c[i], in a calculation with (w) and without (wo) the tetraneutron, are shown in the same conditions as the top panels. In all panels, the temperature is fixed to 4 MeV, the FSU EoS is considered, and the scalar cluster–meson coupling is taken as x_s = 0.85 (solid) and x_s = 0.92 (dashed).