Inferred SEP injection times shifted to 1 au (vertical lines with temporal error bars on top) overplotted on the radio spectrogram as observed from STEREO-A/WAVES and Earth (ASSA, and YAMAGAWA) and the X-ray count rates from Solar Orbiter/STIX. The zoom-in on the right corresponds to the dashed line square indicated on the left. It shows Fermi-GBM X-ray count rates against the same radio spectrogram. The STIX times have been shifted by 30 s for comparison with electromagnetic observations from 1 au. Legend on the top right refers to lines in panels (a), (b), and (c). The observed radio structures are indicated in panels b and c. Details given in the main text.