OptionalcloseOptionalhighHigh column. Default 'high'.
OptionallowLow column. Default 'low'.
OptionalopenOpen column. Default 'open'.
OptionalperiodSummation look-back in bars. Default 10.
OptionalprefixColumn-family prefix — appends ${prefix} and ${prefix}Signal.
Default 'rvi'. Note rvi is also the usual abbreviation of the
Relative Volatility Index, which is a different study and now ships as
relativeVolatilityIndex; it takes relVol as its default output
precisely so the two can coexist on one series.
Close column. Default
'close'.