Equatorial rotational velocity as a function of r. Both curves correspond to v_cor = 2500  km s^-1. However, the dashed red curve is plotted with R_cor = R_∗, while the solid blue curve is plotted with R_cor = 16   R_∗. We also denote an estimate of the LFR of the line He ii λ4686, determined by its corresponding ξ plot. Note that the LFR remains unaffected by rotation unless large co-rotation radii are assumed.