The PTM proportional tubes 2.21 Triggering the E665 detector. 2.22 Data acquisition and on-line monitoring 3 The E665 event reconstruction program 3.1 3.2 3.3 Reconstruction overview Event split. . Event filtering 3.4 Decoding and translation of the raw data. 3.5 3.6 Pattern recognition Track fitting. 3. 7 Muon match .