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Fig. 1.


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Active region NOAA 12579 on August 25 2016: HMI magnetogram (panel a). Hα image (Bass2000 survey, panel b). GST images of the leading sunspot in TiO (panel c), in Hα (panel d). The red boxes in panel a and panel b have the same FoV, corresponding to the FoV of panel c and panel d.

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