The n-tuple files are available on CERN's CASTOR storage system. They can be found in the directory tree

/castor/cern.ch/user/d/dmaitre/BlackHatSerpaNtuples/PROCESS/ENERGY/

which has one subdirectory per contribution type. One can obtain a list of types by giving the command (for example)

rfdir /castor/cern.ch/user/d/dmaitre/BlackHatSherpaNtuples/Wm2j/7TeV/

which would produce the output,

born
loop
real
vsub

The n-tuple files can also be found on the LHC Grid. They are stored on the SE of the Durham node. To access the files, one needs access to the logical file catalog (lfc) that the 'pheno' VO uses. To obtain access, execute the command

  export LFC_HOST=lfc.grid.sara.nl

One should then be able to list the n-tuple files for a given process, for example W^-&asymp+3 jets at 7 TeV

  lfc-ls /grid/pheno/BHSNtuples/Wm3j/7TeV/