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Because of the cumulative nature of evolution, it is possible that a
small difference in the sampled value of a measure early on in a pair
of runs will be magnified into a large difference later on, even if
the two runs are actually proceeding in a fairly similar fashion.
In order to gauge the magnitude of this effect, a duplicate set of
tests was run, which used the difference
in value between adjacent sample points as the figure to compare
between runs, rather than the absolute value of the sample
points. Using differenced data should reduce the influence of any
cumulative disparity between runs.