Reference

All functions
henderson()	Apply Henderson linear filter
ic_ratio()	Compute IC-Ratio
macurves()	Get Macurves Filters
select_trend_filter()	X-11 Selection of Trend Filter
x11_extreme_values_corr()	'X11' Extreme Values Corrector
x11plus()	Perform an X-11 like decomposition with any (non integer) periodicity.
x11plus_trend()	X-11 Decomposition With Custom Trend Filters