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We use aMC@NLO to study the production of four charged leptons at the LHC,performing parton showers with both HERWIG and Pythia6. Our underlying matrixelement calculation features the full next-to-leading order $O(\alpha_S)$result and the $O(\alpha_S^2)$ contribution of the $gg$ channel, and itincludes all off-shell, spin-correlation, virtual-photon-exchange, andinterference effects. We present several key distributions together with thecorresponding theoretical uncertainties. These are obtained through aprocess-independent technique that allows aMC@NLO to compute scale and PDFuncertainties in a fully automated way and at no extra CPU-time cost

Four-lepton production at hadron colliders: aMC@NLO predictions with theoretical uncertainties