Smoothed GOES X-ray fluxes in 1 Å − 8 Å and 0.5 Å − 4 Å. Flare phases are marked with black vertical lines between the flare onset at 08:40 UT and the second flare onset at 08:44 UT and between the second flare onset and the peak X-ray flux at 08:47 UT. The dashed line highlights the onset of the main group of type-III radio bursts (08:38:30 UT–08:40 UT) at the end of the pre-flare phase.