Time evolution of the X-ray 4–10 keV source during the peak of the X-ray emission. The top panel shows the STIX images reconstructed using the CLEAN algorithm with a 30 s time integration. The green colour map and green contours show the CLEAN intensity maps, scaled to the peak flux, and the contours show the 40–100% levels. The black circle marks the FWHM of the FWDFIT-reconstructed maps over the same time intervals, and the dashed black circle marks the 180″ limit. The corresponding EUI/FSI maps for the two time intervals for which observations are available are plotted below, with the STIX contours over-plotted on top. To over-plot these STIX images on the corresponding EUI/FSI maps, the contours were over-plotted using the ‘SphericalScreen’ context manager available through the sunpy package. For the right-most panel, the STIX contours are shifted by (40″, 20″) to better align with the EUV emission based on the brightest sources.