Spread - Diff
From MultiCharts
The Spread Difference indicator is used to plot the difference between two data series, selected by the user — DataSeries1 and DataSeries2.
This indicator requires two data series plotted.
Default Inputs
DataSeries1( close of data1 ) sets the first data series used in the calculation.
DataSeries2( close of data2 ) sets the second data series used in the calculation.