Advanced Bollinger Bands® (BB) indicator.

The standard Bands.mq4 indicator was complemented with a range of upper/lower band and signal of possible reverses.

Parameters:

• BandsPeriod - indicator period.
• BandsRange - period of determining a range.
• BandsDeviations - number of standard deviations.
• Averaging Fast Period - fast period of averaging.
• Averaging Slow Period - slow period of averaging.

Buffer indexes:

• 0 - Middle line,
• 1 - Upper line,
• 2 - Lower line,
• 3 - Upper range,
• 4 - Lower range,
• 5 - Down signal,
• 6 - Up signal.