From left to right: MDI magnetograms, O v integrated intensity scans and intensity distribution functions obtained from the intensity images. The solid black lines in panels c) and f) show the intensity histograms on a linear intensity scale scale (corresponding to the axes on bottom and left side of panels c) and f). The solid red lines are the normalized histograms of the logarithm of the intensity (corresponding to the axes on top and right side of panels c) and f). The dashed lines are lognormal fits to the normalized histograms. The surface area visible in CDS images is marked by the white rectangles in the MDI magnetograms.
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