EUV filament channel observed at at 17:30 UT in 304 Å (SDO/AIA) with the approximative overlay of the four slits used for the time slice analysis (see Fig. 5). S1 and S2 are the cuts along the section F1 (from east to west), S4 is following sections F2 and F3, S3 the section F4 (see Fig. 1). Between S4 and S3 we see a bright area in the network (around x = −400 and y = −600) where the onset of the eruption occurs. We detect an elongated bright strand below the right part of S3 and an dark absorbing strand below the left part of S3. They correspond to material of the eruption. The temporal evolution is shown in the two movies. The first movie corresponds to the field of view (red box) of S1 and S2 between 09:00 UT and 10:30 UT, and the second movie to the field of view (yellow box) of the slits S3 and S4 between 15:30 UT and 19:00 UT showing the eruption (online movies).