The package deals with the interface between the Fast Simulation and the reco::Tracking package in the Full Reconstruction.
In FastSim a fast tracking is implemented, in which only the RecHits produced by a given simTrack are fitted, so that the time-expensive pattern recognition step can be avoided.
For the track fit, however, the same Iterative Tracking procedure as in the Full Reconstruction is implemented: the configurations in the /python directory are used to steed the customized Iterative Tracking for FastSim.
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