ATLAS Liquid Argon Barrel Calorimeter Performance in the 2004 Combined Test-Beam

During the combined test-beam in summer 2004 a slice of the ATLAS barrel detector - including all detector sub systems from the inner tracker and the calorimetry, to the muon system - was exposed to particle beams (electrons, pions, photons, muons) with different energies (1 GeV to 350 GeV). The aim was to study the combined performance of the different detector sub systems in ATLAS-like conditions. We present performance results from the electromagnetic calorimetry, including uniformity, resolution, and linearity using two different calibration approaches