Fig. A.1.
HMI magnetograms for all flares listed in Table 1, showing the host active region at the time of the flare peak in the GOES 1–8 Å waveband. The red and blue contours show the positions of the composite flare ribbons with positive and negative magnetic polarity, respectively. The green lines join the geometric centroids of the positive- and negative-polarity ribbon components.
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