First column: same as Fig. 13, for the lower limit of supergranulation. The exposure time is the observing time divided by n. Second column: same as Fig. 13, for the higher limit of supergranulation. Third column: same as Fig. 13, for the lower limit of supergranulation superimposed on granulation. Fourth column: same as Fig. 13, for the higher limit of supergranulation superimposed on granulation.