Height of the potential V along the axis connecting centers of mass of the binary components (X-axis). The potential is normalized to its value at the inner Lagrangian point L₁. For all models e = 0.3. The blue, orange, and green lines correspond to orbital phases ν = 0.0π, π/4, and π/2, respectively. From top to bottom, the subfigures correspond to q = 0.1, 1.0, and 3.0, respectively. From left to right, the subfigures correspond to f_don = 0.8, 1.0, and 1.2, respectively.