Dimensionless properties of the simulations vs. the angle width. The color-coding denotes the characteristic Prandtl numbers. The symbols are the same as in Figure 5. The corresponding data can be found in Table 2. Upper left: Prandtl number in the middle of the HI zone; Upper right: Ratio of numerical to SGS diffusivity; Middle left: Ratio of numerical viscosity to SGS viscosity; Middle right: Ratio of the SGS kinetic energy to the turbulent kinetic energy of the resolved scales; Lower left: Maximum Nusselt number; Lower right: Péclet number in the middle of the HI zone.