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	param	t-stat
$ω$	1.2739	3.15
$α$	0.1408	1.81
$β$	0.0042	0.02
$γ_{1}$	16.2861	3.42
$γ_{2}$	-28.0816	-4.05
$γ_{3}$	18.8222	5.17
$γ_{4}$	-9.1288	-4.50

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