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Once you have the files at CERN (probably on pcphuat27), you can also put them to/from CASTOR.
https://twiki.cern.ch/twiki/bin/view/Atlas/CastorPools#How_to_copy_files_from_castor_xr
For instance, to copy a whole directory on pcphuat27 into my castor area (you need an area with write permission!):
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