Fig. 5

Histogram gives the number of pixels displaying intensity within a certain range on 1996 June 6. The 5% pixels with the lowest intensity are shaded dark blue. These plus the lightly shaded blue pixels represent the 10% darkest pixels. Similarly the more strongly shaded red pixels represent the 5% brightest pixels. The 10% brightest pixels are the sum of the pixels shaded in dark and light red.
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