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	param	t-stat
$ω$	0.8148	6.62
$α$	0.1381	1.73
$β$	0.4924	3.13
$γ_{1}$	-0.6090	-3.47
$γ_{2}$	1.0544	4.25
$γ_{3}$	-0.6312	-5.00

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