Top left: binarisation map of the first magnetogram of the series, i.e. acquired at 08:00:42 UT. Pixels in white are those with magnetic flux density Φ ≥ Φ _T = 13 G. Top right: occurrence map of the FoV. Middle left: map of decorrelation times. Middle right: map of the different regions identified in Fig. 5 in red, yellow, blue, and green (see text) superimposed on the occurrence map. Bottom left: horizontal velocity field (gold arrows) computed with FLCT (Fisher & Welsch 2008) superimposed to the occurrence map. The red filled circles mark the locations with the lowest occurrences ( ≤5%). Bottom right: horizontal velocity strength map (grey scale). The decorrelation times map for t_D > 20 min is superimposed with the same color code as in the middle left panel. The green filled circles mark the locations with the lowest occurrences ( ≤5%).