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Rarefaction curves of two 16S rRNA gene libraries from the PCE-dechlorinating continuous-flow column. The clone libraries were constructed from DNA extracted from column aquifer solids sampled 0 to 5 cm from the column inflow and 25 to 30 cm from the column inflow. Dashed lines represent the >95% confidence interval. Sequences were assigned to OTUs if they were less than 3% different from each other.
