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The present tree is based on the relationships among orders. The branch lengths were calculated from the values of $\Delta T_{50}H$ as found in Sibley and Ahlquist (1990, fig. 353).
data(bird.orders)
"phylo"
which
structure is described in the help page of the function
read.tree
.read.tree
, bird.families
data(bird.orders)
plot(bird.orders)
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