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You’ll certainly need a lot of patience, to put it mildly - do you appreciate how rarely prices touch a Bollinger Band of [B]4[/B] standard deviations? I can’t help wondering what made you think this might be a profitable or tradable strategy?
If you see the legend on the deviations part, the BB with 4 sd is the only colored Red and the “lower” pertains to the one placed usually below the price.