The interested reader will notice that
the NASA and Rochester curves stop in 2 and 3 weeks respectively.
The reason is that in order to conduct a meaningful prefetching experiment,
we need at least two time intervals: one interval to find the Top-10, and a
second interval, to give the Top-10 to clients and measure their
hit ratio. Since we had only one month's traces for NASA, the highest
time interval we could simulate was 2 weeks.
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