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Moving Average Convergence Divergence (MACD)
 DarkLight
Moving Average Convergence Divergence (MACD) is a trendfollowing momentum indicator that is calculated as the difference between 26period and 12period EMAs. MACD also provides a signal line, the average of that difference. The indicator triggers when MACD plot crosses above (buy) or below (sell) the signal line.
MACD = 12period EMA  26period EMA
Singal Line = SMA (MACD)
Histogram = MACD Signal Line
where:
EMA – Exponential Moving Average
SMA – Simple Moving Average
INPUTS
Input  Description 

FastLength  The number of bars used to calculate the fast moving average 
SlowLength  The number of bars used to calculate the slow moving average 
MacdLength  The number of bars used to calculate the MACD 
Average 

The following Moving Average types are available for calculations:

PLOTS
The plot renders the data you are working with on the chart. You can show/hide a plot by clicking the corresponding item in the settings. Every plot has a set of basic settings that you can change: color, weight, and type.
Plot  Description 

Value  The Moving Average Convergence/Divergence plot 
Avg  The moving average of the MACD 
Diff  The difference between the MACD and its moving average (MACD Histogram) 
Color 

Click the color rectangle under the plot's name to open the palette. Use the slider at the bottom to set the opacity of the color. To create a custom color:
The customcreated colors are added to your palette. To remove a custom color, drag it out of the palette. 
Weight 
Change the value (in px) to adjust the thickness of the plot. 
Type 
The following plot types are available:

OVERLAYING
Check Overlaying to display the indicator on the chart. Otherwise, the indicator is shown in a study pane down below.