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[[File:Bollinger bands.png|thumb|What Bollinger Bands look like]] | [[File:Bollinger bands.png|thumb|What Bollinger Bands look like|361x361px]] | ||
A technical indicator used by traders to measure market volatility consisting of three lines plotted at standard deviation levels above and below a centre line. | A technical indicator used by traders to measure market volatility consisting of three lines plotted at standard deviation levels above and below a centre line. | ||
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