@param ensembleName Name of the Ensemble the target object belongs to. Null, if the target is a top-level node.
@param target The object about which state history is to be collected
@param stateName The name of the state variable to collect
@param record If true, getData() returns history since last connect() or reset(), otherwise getData() returns most recent sample
@throws SimulationException if the given target does not have the given state
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