Acoustic radius at the base of the convective envelope (t_BCE, solid line) and at the base of helium-ionization zone (t_He, dashed line) compared to total acoustic radius T as a function of the stellar luminosity for (left panel) 1.0 and (right panel) 2.0 M_⊙ models at solar metallicity following standard (black line) and rotating prescriptions (red line); (from left to right) on the main sequence, the sub-giant branch, red giant branch, and helium burning phase.