View of a 1.0 M_⊙ MS primary star in a binary system, cut in the plane including all the rotations axes of the system. The companion to this star is a 0.2 M_⊙ MS secondary star with an orbital separation of r = 2R₁. The black curve corresponds to the Roche lobe of the primary star. The black lines respectively correspond to the reference direction for θ and to the reference direction in witch our model is given by the 1D spherical symmetric model (θ = μ_crit). The blue lines are equipotentials inside the star with the colourbar representing the total potential. On each equipotential the pressure, density, and temperature, are constant. L₁ is the Lagrangian point and R₁ is the radius of the initial 1D model in the reference direction.