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	param	t-stat
$ω$	0.5821	6.27
$α$	0.1722	8.21
$β$	0.5999	12.31
$γ_{1}$	-0.3188	-4.53
$γ_{2}$	0.4090	4.00
$γ_{3}$	-0.1648	-2.11
$γ_{4}$	0.2178	2.76
$γ_{5}$	-0.2193	-2.73
$γ_{6}$	0.1135	1.14
$γ_{7}$	-0.1001	-1.09
$γ_{8}$	0.1169	1.61
$γ_{9}$	-0.0819	-1.62

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GAS Natural BAN SA Zero Slope Spline-GARCH Volatility Analysis

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