Fig. 4
Penumbral brightenings in the IRIS 1400 Å SJ band (top row). The other rows show difference images in the 1400, 1600, 171 and 335 Å bands, normalized to the minimum and maximum intensity for clarity. In the left column we give a 2832 Å continuum image, as well as full-range and saturated magnetograms for reference. The images have been rotated by 44° counter-clockwise.
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