Upper panels: heat transport for a 1.1 M_⊙ star (Z = Z_⊙) at three different epochs indicated in each panel with the terms non-stationary (; magenta solid line), barotropic (; blue dashed line), baroclinic (; red dotted line), and advective (; black long dashed line), and the contribution due to nuclear and gravitational energy variations (; green dashed-dotted line). Lower panels: similar to the upper panel with a zoom on the small amplitude components. Hatched areas indicate the convective envelope.