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PAH levels in oysters at various sites (Figure 4A) and at different time intervals (Figure 4B). The method used for statistical analysis is described in the methods section. The error bars show the range (lowest to highest value) obtained. The lowest value is within 25th percentile −1.5XIQR while the highest value is still within the 75th percentile +1.5XIQR, and the horizontal line in the box represents the median value.
