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The FNAL experiment E773 has measured the phases Phi_{+-} = (43.35 +- 0.70 +-0.79) degree and Phi_{00}-Phi_{+-} = (0.67 +- 0.85 +- 1.1) degree of the CPviolating parameters eta_{+-} and eta_{00} in the decay of neutral kaons intotwo charged or neutral pions. These preliminary results test CPT symmetry andshow no evidence for a violation. In addition we present a preliminarymeasurement of Delta m = m_L - m_S = (0.5286 +- 0.0029 +- 0.0022)*E+10 hbar/secand tau_S = (0.8929 +- 0.0014 +- 0.0014)*E-10 sec. The first errors arestatistical and the second errors are systematic for above results.Comment: 9 pages, EFI 94-31 (replaced postscript file by uuencoded compressed  postscript file

CPT tests in the neutral kaon system by FNAL E773