Dependence of spin frequency of configurations on the angular momentum. The constant rest mass evolutionary sequences are shown by dashed lines and the Keplerian sequence by the solid line. The low-J results (cJ/GM_⊙ ≤ 0.4) were obtained by interpolation. The supramassive sequences (not shown) spin-up as they approach the onset of instability. The upper panel corresponds to EoS A and the lower panel to EoS B.