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The chart displays the exponential percentage determined by the period used in the MACD calc.
exponential percentage = 2 / (period + 1)
exponential percentage = 2 / (12 + 1) = 0.1538 or 0.15
the 0.075, 0.15, 0.20 settings are equivalent to 26,12,9 period settings
Hope this helps.
cb
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