Fig. 2. Gravitational mass as a function of the rotation frequency for the SS2 model. Thin solid lines correspond to evolutionary sequences with fixed baryon mass labelled close to each line. The angular momentum increases along each curve from for static configurations ( for supramassive stars) to for the Keplerian ones represented by filled circles for normal and low massive supramassive stars. The thick lines correspond to the upper limits on gravitational mass and rotational frequency; the dashed line corresponds to the mass-shed limit, the long-dashed line is the quasi-radial stability limit and the dashed-dotted line shows the fastest rotating configurations.