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Table 2 Branch model results of three genes with ω > 1. ω = dN/dS, the ratio of nonsynonymous/synonymous substitution rates. np: number of parameters. ln L: log likelihood values. LRT: likelihood ratio test

From: Plastome phylogenomics of Saussurea (Asteraceae: Cardueae)

Genes

Model

np

ln L

Estimates of parameters

LRT P value

psbL

Two ratio Model 2

67

−177.133731

ω0 = 2.64875

ω1 = 1.71333

0.9984

Model 0

66

−177.133729

ω0 = 2.64876

ycf2

Two ratio Model 2

67

−10,731.616197

ω0 = 1.39172

ω1 = 1.98555

0.7353

Model 0

66

−10,731.67334

ω0 = 1.40184

psbZ

Two ratio Model 2

67

− 1424.307323

ω0 = 2.73007

ω1 = 2.21091

0.9972

Model 0

66

−1424.307317

ω0 = 2.73007