Table 1.

Selective patterns for LWS opsins

Model	npa	Ln Lb	Estimates of ω	Models compared	LRTc	P Values
Branch model
A: one ratio	175	−41372.52	ω = 0.06527
B: one ratio ω = 1	174	−47529.36	ω = 1	B vs. A	12313.68	0.0
C: the LWS2 branch has ω2, the LWS1 branch has ω1	177	−41347.92	ω2 = 0.08202	A vs. C	49.2	0.0
			ω1 = 0.02536
D: the LWS2 branch has ω2 = 1	176	−41783.48	ω2 = 1	D vs. C	871.12	0.0
			ω1 = 0.02515
E: each branch has its own ω	347	−41045.37	Variable ω by branch	A vs. E	654.3	0.0
Branch-site models
G: the LWS2 branch	178	−41152.48
H: the LWS2 branch has ω = 1	177	−41152.48		H vs. G	0.0	1.0

^aNumber of parameters

^bThe natural logarithm of the likelihood value

^cTwice the log likelihood difference between the two models