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Fig. 1.

Fig. 1. Refer to the following caption and surrounding text.

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Active region NOAA 12241. a) Full-disk image in 171 Å observed by SDO/AIA on December 18, 2014, at 21:24 UT. The blue rectangle indicates the active region under study. b) Zoom-in of the active region in 171 Å. c) LOS magnetogram taken by SDO/HMI. The red rectangle indicates the horizontal domain for the numerical simulation.

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