South-centered QuACK-maps of the average surface illumination received during the respective observational periods of the four sequences. The intensity units are the same as in Fig. 8. The mean values within the suspected source regions are indicated by the orange shapes and lines, with the areas that were selected during the respective sequences highlighted in bold. The values here are generally higher than in Fig. 8 because here the illumination was averaged over time periods when the areas were mostly in sunlight, while in Fig. 8 the illumination was averaged over a whole day-and-night cycle.