Profiles of luminosity (top panel), entropy (middle), and radius (bottom) in the stellar interior at 0.1 (red solid line; just after the accretion is completed), 1.0 (green dashed), 2.9 (blue dotted), and 5.1 (magenta dot-dashed) million years. As the luminosity propagates toward the surface, the entropy is redistributed. Crosses represent the base of the surface convective zone; k_B and m_amu are the Boltzmann constant and the atomic mass unit, respectively.