Additional file 1.

Comparison of beta diversity results for 331 samples sequenced on both 454 and Illumina. Procrustes plot comparing principal coordinates of unweighted UniFrac distances. Lines connect paired samples sequences on 454 (white tip of line) and Illumina (red tip of line). The Illumina samples were evenly sampled to 5,000 sequences per sample and the 454 samples were evenly sampled to 500 sequences per sample.

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Caporaso et al. Genome Biology 2011 12:R50   doi:10.1186/gb-2011-12-5-r50