a) Image of the AR NOAA 11494 and the flare from STEREO/EUVI-B at 195 Å: the red line marks the position of the solar limb as seen from SDO (or Earth). b) RGB (red, green, blue) image of 131, 171, and 193 Å snapshots from SDO at the time of the flare: the release of the plasma bubble after the flare is visible in the red (131) channel. c) Adaptation of the white rectangle in b) at 171 Å showing the loop system with the overplotted slits (white and red continuous lines). The movie available on-line shows the temporal evolution of the RGB image of the white rectangle in panel b) and the time evolution of panel c). The movie also contains the time-distance maps shown in Fig. 3.