Longitudinal (top panels) and transversal (bottom panels) integral length scales of different realizations as a function of the radial coordinate. Left panels: Comparison of different θ_width models; Right panels: Comparison of θ_width = 6° models with different resolutions. The vertical dashed lines separate the different regions of the convection zones: the dynamically stable zone, the overshooting region, the convection zone corresponding to the HeII ionization layer, the counter gradient zone that connects the HeI ionization and the HeII ionization layers, and the convective zone belonging to the overlapping HeI and HI ionization. The thin dotted lines denote the horizontal length of a cell (bottom) and the total horizontal domain in the 6° wide model (top).