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Fig. 1

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Active region NOAA 11117 at the limb as seen in AIA-131 Å and 193 Å channels on 31 October 2010. The two right panels show temporal variations between 13:15 UTC and 13:25 UTC (See Sect. 3.1). The cross signs A and B indicate darkening in AIA-193 Å coinciding with brightenings in AIA-131 Å.

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