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Fig. 2.


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Temporal evolution of the active region NOAA 12579 observed with the SDO/HMI between August 23 and August 26, 2016. Top panels: magnetograms, with the blue contour lines representing the magnetic field boundary of −600 G. Bottom panels: continuum images, with the red, and green contour lines corresponding to umbra and penumbra values of 0.7 I0 and 0.87 I0, respectively.

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