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Biplot of dN/dS versus dS medians obtained over branches of the phylogenomic ML tree of the six alvinellid species with the free-ratio branch-model M1 implemented in PaML 4.0 (Yang 2007). Branch values are significantly (P < 0.01: Pearson’s r test) linearly regressed without using the branch leading to Alvinella spp. (outside of the confidence envelope at 95% for the whole dataset).
