Fig. 3
Backward evolution of the orbital period Porb (solid
line) and the rotation period Prot (dotted line) vs.
time since the present epoch for different values of the modified tidal quality
factor 
and a
stellar braking law with Psat = 6.0 days. From left to
right, the values of are:
5 × 107, 2 × 107, 107, 3.8 × 106, and
106, respectively.
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