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5% of the variability. PAH concentrations at these Great Lakes sites tend to be elevated when the wind is coming out of the south-southeast, and this factor represents about 1.2% of the variability. PAH concentrations are lower when the wind speed is higher; this is a significant but small effect, representing only about 0.17% of the variability. The sum of these partial variabilities is about 80%, which suggests that the measurement and sampling errors are about 20%, which is a reasonable value. On the basis of two approaches, the ran