Fermilab-Tevatron. Measurement of the TOP TOPBAR production cross section in PBAR P collisions at a centre-of-mass energy of 1.96 TeV using the kinematic characteristics of lepton plus jets events. The analysis considers the final state of the top quark pair containing one high-PT electron or muon and at least 4 jets. A top quark mass of 175 GeV is assumed. The data have a total integrated luminosity of 425 pb-1.