Fig. 1.
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Overview of the filament on 2020 May 25. The black rectangle in (a) outlines the field of view (FOV1) from Fig. 2, and the white rectangle outlies the field of view (FOV2) from Fig. 3. Arrows in (a)–(c) denote the brightening; (b)–(d) are overlaid with the Hα filament contour; and P and N in (d) are two magnetic patches with opposite polarities.
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