Dimensionless torques τ_ml for the cases m = 1,l = −1 (solid curve), m = 2,l = −1 (dashed curve), and m = 2,l = 1 (dotted curve) as functions of eccentricity e. The solid curve ends at e = 0.58. At this value of eccentricity, the apocentre distance r_p = a(1 + e) is equal to r_{(1, − 1)} given by Eq. (77). At larger values of e, the corresponding resonance lies within the binary orbit. Also, the case m = 2,l = 1 shown for illustration corresponds to prograde orbital motion of the binary.