Penumbral thermal structure below the visible surface

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Fig. 2

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Histograms of ξ(T) as defined in Eq. (1). Red lines correspond to the penumbral region (bottom panels in Fig. 1). Blue lines correspond to the bright penumbral filaments (white contours in the bottom panels of Fig. 1). The vertical dashed lines indicate the mean values of the histograms, .

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