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Fig. 3


Panels a)d): temporal evolution of two BPs (yellow circles), associated upflows (white arrows) in IRIS 1330 Å and 1400 Å images and the locations of BPs in HMI LOS magnetogram. Panels e)h): IRIS 1330 Å images showing the repeated appearance of another drastic upflow. Panels i)l): SDO/AIA 171 Å images showing the relatively steady EUV threads, and HMI magnetograms presenting magnetic flux cancellation at the concentration area of several BPs.

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