Fig. 4. Gravitational mass vs. radius for stars described by the SS2 model. The thin solid lines correspond to sequences of stars with constant rotational frequency . The rotational frequency is labelled close to each line. The thick lines (solid and short-dashed) correspond to configurations with the maximal mass in each sequence. The dashed line corresponds to the mass-shed limit and the long dashed line is the quasi-radial stability limit. The intersection of the mass-shed and the stability limits gives the location of the configuration rotating with maximum frequency.