Dynamic spectra from the Ondřejov and BLEN7M Callisto radiospectrographs. The BLEN7M Callisto and RT5 radio spectra (upper and lower panels) show bursts from the SPDB group only in the time range 07:01–07:02 UT. The 4 s duration of the selected SPDB is indicated by purple vertical lines in the spectra. Points A, B, and C in the spectra (marked by green crosses) correspond to locations along the coronal loop where the radio emission was calculated. The radio fluxes are presented in relative units.