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The NMI scores of ESPRIT-Tree applied to simulated reads extracted from various hypervariable regions including V2, V4, V6, V3–5, V6–9 and near full-length 16 S rRNA gene. The species assignments were used as ground truth. The scores peak at different distance levels. The circles indicate the distance levels where the estimated numbers of OTUs equal to the numbers of species in the test data sets. Colour version of this figure available at http://bib.oxfordjournals.org.
