Panel a): SDO/AIA 171 Å image showing the large quiescent filament on 2015 Feb 13. The black square displays the FOV of the zoomed images in panels b)–e). Panels b)–e): multiwavelength images of SDO/AIA, IRIS 1330 Å, IRIS 1400 Å, and SDO/HMI LOS magnetogram showing the subarcsecond BPs underlying the filament and bidirectional (red and white arrows) loop-like structures at regions “R1” (red square) and “R2” (white square).
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