OptionalcolumnSource column to average. Default 'close'.
OptionaloutputName of the appended column. Default the study name ('sma' /
'ema', and 'ma' for movingAverage); pass an explicit name to stack
several (e.g. sma20, sma50).
Window length in bars (a count, not a duration).
Options shared by the single-line moving averages.
columnis the source field (defaultclose);outputnames the appended column.