Fig. 2
Top panel: tKL shown as a function of the semi-major axis (dashed black line) and tJ2|i = 0 plotted for different values of the ratio between the principal axes of the ellipsoid rc ∕ra. The blue line is for rc∕ra = 1∕2, the magenta line is for rc∕ra = 3∕4, and the green line is for rc∕ra = 9∕10. Bottom panel: critical semi-major axis drawn as a function of the rc∕ra ratio.
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