Boost factor of systems with constant total mass m_tot = 2M_⊙. The radial evolution is shown for three different systems: m₁ = 1.0 M_⊙, m₂ = 1.0 M_⊙ (red dots), m₁ = 1.5 M_⊙, m₂ = 0.5 M_⊙ (green dots), and m₁ = 1.8 M_⊙, m₂ = 0.2 M_⊙ (blue dots). The vertical dashed line marks the MOND radius $r_{\mathrm{M}}=\sqrt{G{m}_{\mathrm{t}\mathrm{o}\mathrm{t}}/a_0}$. The horizontal dashed lines mark the respective boost factor in the deep MOND limit according to Eq. (36). For comparison, the solid lines show the boost factor obtained from the analytical two-body force from (Zhao et al. 2010, their Eq. (A2)).