Fig. 2.
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Large-scale magnetic field topology of AR 12418 on 16 September 2015 from NFFF extrapolations. Top row: full domain at 14:48 and 15:48 UT on top of Bz with open and closed MFLs. Middle (bottom) row: MFLs originating in the sunspot at 14:48 UT on top of Bz and AIA 1700 Å (AIA 304 Å and AIA 171 Å). The black square in the middle-left panel indicates the area of the initial seed points for the identification of closed MFLs. The FOV of the top row is slightly zoomed out to show the large-scale connectivity.
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