Similarly as in Fig. 2, this series of six two-dimensional simulations in the equatorial plane shows the dependency of the solution on the mass ratio M_x/M_∗ and the mean radius of the primary. The masses of the primary and the compact companion for all three cases can be found in Table 2. The shape of the primary, represented by an equipotential surface, is a function of M_∗ and M_x. The white index in the upper-right corner of each panel represents the volume of the primary as a fraction of volume of the critical Roche equipotential. We disregard the effects of the X-ray ionization in these simulations. α is set to 0.6 and the k parameter is kept constant at 0.25. Changes among the simulations become more pronounced as we take into account the scale differences. For a given value of P_orb, D grows with increasing overall mass of the system. The panels show the density distribution after the solution reached the quasi-stationary state, ~3P_orb. (This figure is available in colour in the electronic version of the paper.)