Left panels: A) and C) Si IV slit jaws (47′′ × 47′′) respectively at 12:38:28 UT and 13:00:32 UT showing the cuts of the time slice when the flows are crossing the IRIS slits. Right panels: time slice diagrams are presented in pairs corresponding to MgII and Si IV slit jaws for each cut. B) corresponds to the cut in A), D) to the cut in C). The time slice diagrams show parallel straight lines indicating flows going towards the southeast/northwest direction with a projected speed respectively of 52.5 and 33.6 km s^-1. (A Si IV slit-jaw movie is available in the online edition, see also Fig. 14.)