Bollinger band bottom as a function
BBBotF(expr, len, mult)
expr - data series formula
len - lookback period
mult - number of standard deviations
The BBBOT indicator always uses the series of closing prices for its calculations.
This function makes it possible to calculate the Bollinger band bottom of any series of values.
This function supports ultra-fast one-pass calculation when used in the Data Section with a non-variable count.