a)–e) Snapshots of the base-difference images in 171 Å. The pre-flare dimmings and twin dimmings are pointed out by the white arrows. In panel b), two circles mark the locations of two representative pre-flare dimmings (D1 and D2). In panel e), a curved slice S0 (green dashed line) is used to investigate the temporal evolution of the coronal dimmings. The intensity contours of the 94 Å image in Fig. 1b are overlaid with red lines. f) AIA 1600 Å image at 17:26:40 UT that features two bright flare ribbons. The temporal evolution of the flare is shown in a movie available online.
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