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	param	t-stat
$ω$	0.5790	6.27
$α$	0.1715	8.16
$β$	0.5984	12.14
$γ_{1}$	-0.3222	-4.55
$γ_{2}$	0.4140	4.03
$γ_{3}$	-0.1686	-2.17
$γ_{4}$	0.2218	2.83
$γ_{5}$	-0.2212	-2.68
$γ_{6}$	0.1147	1.12
$γ_{7}$	-0.1038	-1.11
$γ_{8}$	0.1243	1.69
$γ_{9}$	-0.0898	-1.75

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GAS Natural BAN SA Zero Slope Spline-GARCH Volatility Analysis

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