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Fig. 1.
Overview images of the sunspot studied here as observed by the SDO/HMI continuum (left), IRIS 1400 SJI (middle), and SDO/AIA 171 Å (right) channels at approximately 13:56:30 UT on 21 May 2015. The blue contours in each panel outline the umbra of the sunspot as inferred from the SDO/HMI continuum image.
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