Observation of HRI_EUV showing that the large bright footpoint region of the different loop systems, where we observe the strongest upflows, is rather stable over time. All plots are re-projected to an Earth-based helioprojective coordinate system. Top-left panel: three different loop systems. The left one corresponds to the longer loops which are clearly visible in AIA 193 Å. The central one connects to HMI polarities at [−90″, 50″] and the right one, which is the shortest connects to negative polarities at [−70″, 55″]. Top-right panel: structure and loop systems remain stable over a time period of 30 min. Bottom-left panel: brightenings at the footpoints of the central loop system are highlighted, such as isolated brightenings within individual loops. Bottom-right panel: loop brightenings and travelling brightenings flow along the medium-sized central loops and the shorter loops in the eastern system.