Figure 1.

Transformation from a phylogenetic tree to a variance-covariance matrix under the Brownian Motion (BM) model: the variance is set to be the branch length from the root to the tip. The covariance is the branch length from the root to the most recent common ancestor.

Villemereuil et al. BMC Evolutionary Biology 2012 12:102   doi:10.1186/1471-2148-12-102
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