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Fig. 2


Reconstructed images of the granulation at three opacity levels in the 630.15 nm Fe i line. The geometrical scale is in arcseconds. Left panel: image at continuum level. Middle panel: image at line-center level. Right panel: image at line cord index 6 (close to the contrast inversion layer). Color code: the mean image intensity, Im is coded in black. The intensity range in each image is coded on 4 colors, showing respectively the levels  [Im + (Imax − Im)/2;Imax] : red,  [Im;Im + (Imax − Im)/2] : magenta,  [Im − (Im − Imin)/2;Im] : cyan,  [Im − (Im − Imin)/2;Imin] : blue. Imax and Imin denote respectively the maximum and minimum intensity in the image. The white circles show examples of structures exhibiting contrast inversion in the upper photosphere.

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