(Bari, Pavia and Sofia), where equivalent software and hardware tools are used. Data from
the first 210 detectors are available for a comprehensive analysis. The paper describes the
general experimental set-up, the test procedure and the cosmic muon test results. The muon
trajectory reconstruction algorithm, used for precise studies, is presented. The criteria to
accept or reject a detector are also given. The CMS final-design chambers show an average …