SDO/AIA multiwavelength images for the four periods shown in Fig. 3. Contours of the corresponding 17 GHz images are overplotted. To facilitate comparison between EUV and radio images, the AIA images are also averaged over a 2-min period. At the peak of the gradual emission, some of the AIA images saturate. The white line marks the neutral line of the line-of-sight magnetic field. Contours of RHESSI images at 6–12 keV and 25–50 keV are also shown for the flux peaks of the impulsive and the gradual emission. The contour levels are 90%, 70%, and 50% of the corresponding peak brightness. The front segment of detectors 4, 5, 6, 7, and 8 are used to construct the RHESSI image with the CLEAN algorithm with an integration time of 20 s.