Surface brightness versus the V − K color for the M3 model (Table 1), considering the C3 interferometric configuration (Table 2). The rotational velocity of the star is indicated in percentage of the critical rotational velocity (V_c), together with the inclination angle (in degrees). The corresponding projected rotational velocity V_rotsini are also indicated by dotted lines. The orange solid line is the SBCR found for the static models (see next section). The violet dotted line is the empirical SBCR from Challouf et al. (2014b), together with its dispersion (red dot-dashed line).