2) Bollinger Bands (Basis - )
3) Dispersion (around basis)
Signal for purchase: crosses the dispersion zone upwards
Signal for sale: crosses the dispersion zone downwards
Buffer zone: white area, it is not recommended to make transactions.
--- Add (02.10.2018)
1) lines (overbought / oversold) = 70 / 30. Сan be changed in the settings.
• line crossover Dispersion Zone (green)
• line crossunder Dispersion Zone (red)