(a) STIX X-ray spectrogram with the time series of the summed non-thermal energy bands overplotted on top of it. The plot shows the three major non-thermal periods. (b), (c), and (d) show the type III bursts observed by ORFEES, I-LOFAR, and WAVES in the frequency range from 1–1004 MHz. Clearly there is a temporal association between each individual HXR period and groups of radio bursts.