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The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF

(Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide.

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This article is distributed under the terms of the Creative Commons

Attribution Noncommercial License which permits any noncommercial use, distribution,

and reproduction in any medium, provided the original author(s) and source are credited.

JHEP12(2010)060

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