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An index value of the current Bars object that has called the OnBarUpdate() method. In a multi-bars script, the OnBarUpdate() method is called for each Bars object of a script. This flexibility allows you to separate trading logic from different bar events. In a single Bars script this property will always return an index value of 0 representing the primary Bars and instrument the script is running on.
See additional information on running multi-bars scripts.
An int value represents the Bars object that is calling the OnBarUpdate() method.