Dynamic spectra and images of the two J-bursts and the U-burst. Each burst is imaged at times corresponding to the peak flux in all frequencies taken from the fit using Eq. (1). The frequencies shown are the central frequency from each sub-band. The image background is AIA EUV at 171 Å. The small red contours in the bottom left are the RHESSI 6−12 keV contours that were imaged over the minute when the radio bursts were detected.