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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.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.