Solar Orbiter/STIX and pre-flare-subtracted SDO/AIA images of the SOL2021-10-09 event. The figure has the same format as Figs. 3 and 4 except that more time instances and AIA filters have been considered. The contour levels of the STIX images produced in the energy interval from 5 to 9 keV correspond to the 50, 70, and 90% of the maximum, whereas the ones produced within the 22–50 keV range are 50, 60, 70, 80, and 90% of the maximum.