Fig. 4.

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(a) LOS magnetogram of AR 11236 at 01:02:56 UT. The cyan crosses represent the locations of sigmoid in 94 Å. (b) Large-scale 3D magnetic configuration around the AR at 00:04 UT derived from PFSS modeling. The white and magenta lines represent the closed and open field lines. The orange arrow indicates the projected direction of the filament eruption.
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