It's a simple indicator which forms an alert when new bar comes. Input parameters provide the ability to generate text, sound alerts and e-mail notifications.
Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/16493
This indicator is constructing "bands" using 3 quantile values.Bollinger Bands with Filling
This version of Bollinger Bands has a choice of calculating the standard deviation as a sample or as an uncorrected deviation.