Additional file 3: of Improved taxonomic assignment of human intestinal 16S rRNA sequences by a dedicated reference database

Rarefaction based on known taxa. The figure shows the numbers of taxa calculated from samples of sequence data used for constructing the HITdb. Boxplots showing the numbers of found species (A) and genera (B) at two sample sizes (about 90 % and 80 % of sequences, n = 9 and n = 10, respectively). The horizontal red dashed line shows the number of OTUs in all sequences (100 % of sequences). (PDF 52 kb)