ATLAS Offline Software
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contains the PileUpMergeSvc and a number of related tools. PileUpMergeSvc is the preferred mechanism to access information from the different event stores in a pileup job.
More information is available from the pileup wiki (https://twiki.cern.ch/twiki/bin/view/Atlas/PileupDigitization)
The code can be browsed using LXR (http://alxr.usatlas.bnl.gov/lxr/source/atlas/Control/PileUpTools/)