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Have a look at the figure on the left. It shows the number of visits to this site broken down in hours of the day -the time of the server used by the visitor. The statistics of each bar is sufficient that the uncertainty on their height is of the order of 2%, so almost indistinguishable by eye. What you can see, therefore, are real variations with time of the traffic to this site, and not random fluctuations up and down.




