Ensemble-averaged active-region flows. Δϕ and Δλ are the longitude and latitude with respect to the center of the active region. The flows close to the center of each polarity have been masked out before averaging because LCT flows in highly magnetic regions are not reliable (Löptien et al. 2017). The background shows the ensemble-averaged line-of-sight magnetic field. For a given value of b that determines a contour for an individual active region, we draw the line delimiting the areas included in the contours for at least 90% of the active regions used in the ensemble average; we try the following values of b: 4 G, 3.5 G, and 3 G (dotted, solid, and dashed green lines, respectively).