Snapshots of diffuse region and bright point without time-averaging. The snapshots at three times as indicated by the time stamps are shown in the three columns. The top row shows the diffuse region (marked i) and the bottom row the bright point (marked ii). Images are commonly scaled to the same minimum and maximum values of intensity. Boxes a–d have the same meaning as in Fig. 4. See Sects. 3.2 and 4.1.