A Keltner Channel is a volatility based technical indicator composed of three separate lines. The middle line is an exponential moving average (EMA) of the price. Additional lines are placed above and below the EMA. The upper band is typically set two times the Average True Range (ATR) above the EMA, and lower band is typically set two times the ATR below the EMA. The bands expand and contract as volatility (measured by ATR) expands and contracts.
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