SDO/AIA image at 335 Å (top) and 94 Å (middle and bottom), on February 15, 2011, around 01:51:15 UT. In the middle image, the region bordered in red is not clearly detected at 335 Å (most probably the plasma temperature is higher than 6 × 10⁶ K; see text); regions bordered in yellow are seen in both channels (probably the plasma temperature is close to 1 × 10⁶ K). Bottom: image at 94 Å on which RHESSI contours are overlaid. The green, blue, and yellow contours are the RHESSI emissions at 12−25 keV, 25−50 keV, and 50−100 keV, respectively, integrated between 01:51:00 and 01:51:16 UT. The contour levels are similar to the ones in Fig. 3.