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root
[0] TFile f("<filename>","update")
[1] .q

To find info on MC or data, use ATLAS Metadata Interface (AMI). Click on "AMI Dataset Search", then enter your search term (name or datasetNumber or whatever) to find all datasets, for instance "Zmumu" or "105145".
Under "dataType" you can group them by clicking the little icon. Choose "EVNT" to see generator info for MC.
Click on "details" in the left column to see cross-section info, the jobOptions used, etc. You can see the jobOptions file via (after setting up an ATLAS release):

Code Block

 get_files -jo -list MC8.105145.PythiaZmumu.py

(Do "get_files -h" for more info on this useful command...)

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Please add tricks of your own!