Table 3.

Curve-Fitting Parameters with 95% CIs.

Protein	Adaptation Time τ (years)	Equilibrium Value (if different from 1.0)	Host-Shift Year
H1	33.50 (33.21, 35.42)	1.08 (1.08, 1.09)	1907.3 (1906.1, 1907.8)
N1	33.57 (31.10, 35.64)	1.04 (1.03, 1.05)	1905.1 (1903.4, 1906.8)
NS1	71.54 (62.88, 84.03)		1894.6 (1891.5, 1903.5)
NP	31.94 (23.58, 43.29)	0.98 (0.97, 0.99)	1894.9 (1883.0, 1904.9)
PA	50.36 (42.44, 61.76)		1888.2 (1872.5, 1898.0)
PB2	34.15 (24.70, 50.09)	0.84 (0.81, 0.88)	1904.7 (1894.2, 1911.6)