TD_UNDIFF (
(
{ SERIES_SPEC ( differenced_series )
| ART_SPEC ( TABLE_NAME ( differenced_series_table )) },
[ SERIES_SPEC ( original_series ) , ]
FUNC_PARAMS (
LAG( integer ) ,
DIFFERENCES( integer ) ,
SEASONAL_MULTIPLIER( integer )
[ , INITIAL_VALUES( float , ... ) ]
)
) ;