Panels a, c, and e: total (black dash-dotted lines), convective (black), enthalpy (blue), kinetic energy (light purple), radiative (dark purple), and cooling (green) fluxes and the superadiabatic temperature gradient (red) from Runs K4, S4, and DS5, respectively. Panels b, d, and f: total averaged vertical forces (solid lines) and the power of the forces (dashed) on the upflows (red) and downflows (blue) from the same runs. The dotted lines in these panels show the corresponding viscous force and its power. The shaded areas indicate the BZ (darkest), DZ, and OZ (lightest) and the thick black line at the horizontal axis denotes the MZ.