Fig. 1.
Orbits with eccentricities ranging from e = 0.6 to 0.95 with fixed β = 1 (a), and orbits with penetration ranging from β = 1 to 5 with fixed e = 0.8 (b). Each orbit is the trajectory of the centre of mass of a star in the generalised Newtonian potential (Eq. (1)) in one period. The filled circle represents the rISCO, while the dashed circle represents the rt.
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