Figure 2. Distributions of evolutionary rate
(σ2) estimates comparing traditional character coding
with new methods. Each plot shows the distribution of
σ2 values estimated from 100 simulated datasets with a
true σ2 = 0. Simulations were run with 6-, 50-, 100-,
and 490-taxon trees generated using a birth-death model and simulated
species with either cool (24-28°C) or warm niches (25-29°C). Horizontal
axes are plotted on a logarithmic scale.