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High Precision Event Reconstruction

In Au+Au reactions at 1.25 GeV/u up to 200 charged particles are registered in the HADES acceptance. The tracking system of the spectrometer is capable of handling such an amount of tracks at high rates. Extrapolation of the trajectories backward from the tracking detectors to the target region allows the reconstruction of the primary vertex. HADES uses a 15 segmented target to reduce the conversion probability in the target material. The resolutions of the global vertex fit allows to asign individual reactions to the target segment where the reaction took place.