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Fig. 4

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Upper 4 panels: stokes profiles and best fits obtained by the SIR inversion applied to a pixel in a penumbral filament harboring a magnetic field with the same polarity of the umbra. Middle 4 panels: the same for a pixel with the reversed polarity. Lower 4 panels: corresponding atmospheric models. The thick black line corresponds to the profiles shown in the upper row of this figure and the red ones to the middle row.

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