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Grouping of borehole module samples in a PCoA ordination based on Bray-Curtis metrics. PCoA plots were generated including (left) or excluding (right) controls. Ordinations were rarefied to 500 (A), or 2,000 (B) reads per sample. All controls are contained in group I, except two glove box controls from the last day of disassembly. Groups II, IIa, and IIb contain the majority of case and filter samples and separated well from outer (group III) and inner (group IV) bentonite core samples.
