Dependences of the ratio R_e/R on the relative rotational frequency for numerical NS models with various EoS (Cook et al. 1994) for the maximum possible mass (top panel) and the mass M = 1.4 M_⊙ (bottom panel). Red solid curves show the fits with Eq. (2) for the masses M = 2.5 M_⊙ (top panel) and 1.4 M_⊙ (bottom panel). The fitting curve for M = 1.4 M_⊙ is shown in the top panel as dashes. The relative errors of the fits are also shown in the narrow additional panels below the main panels.