Evolution of the direct electric current (in red) and the return electric current (in blue) before, during, and after the X-class flare in regions 1 a), 2 b), 3 c), and 4 d). The light curve (relative intensity normalized to the intensity at 21:00 UT) is also added, corresponding to the full Sun signal in the SDO 335 Å channel (green). The beginning and end of the flare impulsive phase are indicated with dotted vertical lines.
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