Comparison of the initial profiles of the initial MESA model for the primary star (blue) and the modified models with ideal-gas (yellow) and OPAL (red) equations of state before the relaxation. The gray area indicates the region inside the cut-off radius r_cut. The density ρ is shown in panel a (the density profile of the MESA model is hidden behind that of the ideal-gas and OPAL model). The green dots are averaged values of cells in the OPAL model after the relaxation. The specific internal energy u is shown in panel b. The difference between the temperature gradient ∇ and the adiabatic gradient ∇_ad is shown in panel c.