Inspired by EMA CrossOver Bars, this includes a third EMA that we are looking to cross. It also plots the EMA's on the chart.
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Remove unwanted line
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Add a "minimum cross factor" so crosses can be ignored when they do not cross by more than the minimum factor amount.
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Renamed
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Update short title to match renaming
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Include a signal when EMA 4/8 cross. Only signal the EMA 20 cross when counter to the trend (it is intended to indicate potential for a trend reversal).