... 2.5 (e/ ), coarser for 2.5<| |<5 (jet,E T miss ). Electron reconstruction capability from 1-2 GeV (e from b-decays) up to 5 TeV (Z' and W' decays) . Exellent energy resolution over the energy range 10-300 GeV (to achieve 1% mass resolution for H -> and H -> 4e channels). ... Energy-scale precision 0.1% (200 MeV precision on the Higgs mass) Linearity of response better than 0.5% (up to 300 GeV). ... Exellent /jet, e/jet, /jet separation . ...