If MACD is above the signal line, the histogram will be above the MACD's baseline or zero line. If MACD is below its signal line, the histogram will be below the MACD's baseline. Traders use the MACD's histogram to identify peaks of bullish or bearish momentum, and to generate overbought/oversold trade signals.
The difference between the two lines is represented on the histogram. If the MACD were to be trading above the zero line, it would confirm an uptrend, below this and the indicator would be used to confirm a downtrend.
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