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The aim of the MEG experiment is to measure the branching ratio of the rare muon decay ]> at a sensitivity of ≈ 10−13.To reach this goal, the experiment must use the most intense continuous muon beam available (≈ 108μ/s) and obtain the highest energy, time and space resolutions, today reachable. A description of the main properties of each subdetector is given and the detector performances during the first engineering run are presented. PACS 11.30.Hv; PACS 29.40.Mc; PACS 29.40.Gx; PACS 06.20.fb; PACS 29.20.Ba; PACS 25.20.Lj; PACS 29.40.Mc [ABSTRACT FROM AUTHOR]