Intensity evolution of four selected DFs. In panel a, the top section shows the HRI_EUVX − T maps (between t = 28 and 34 min) of slit-1, while the bottom section shows the evolution of intensities in four different imaging channels (HRI_EUV in black, AIA 171 Å in cyan, IRIS 1400 Å in blue and IRIS 2796 Å in red), of the DF that created the parabolic trajectory in the X − T map. The black dotted line in the top section is the parabolic fit to the observed bright track. Panels b–d show the same but for slit-4, slit-5, and slit-3. The grey vertical lines in panels b and d indicate the time when the emission measure analyses as those shown in Figs. 5 and A.1 are performed. Animations associated to this figure are available online.