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This article has an erratum: [https://doi.org/10.1051/0004-6361/201834296e]


Fig. 1.

image

Overview of the acquired data. SOT continuum intensity at 07:47:07 UT on August 31, 2011 of the AR NOAA 11277 (top panel). Longitudinal apparent flux density at the same time (bottom panel). The yellow contour depicts the intensity at 0.5I0 (as in Figs. 6 and 7). The red contour represents the outer penumbra boundary. It was determined by the horizontal magnetic field at Bhor ∼ 490 G.

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