Fig. 9.
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Normalized gravitational potential projected on the spherical harmonics of a star of 0.2 M⊙ in a twin binary system with an orbital separation of a = 2.8R1D. The dotted lines are corresponding to the surface of each star of the system in the direction including the most distorted point of each star and the Lagragian point L1 (μ = 0, ϕ = 0).
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