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Original code from V. Drollinger, see notes
   CMS IN 2005/004
   and http://cmsdoc.cern.ch/cms/PRS/gentools/www/geners/packages/beamhalo/gen_beamhalo.html


For GENMOD = 2, need a link called "input.txt" which must point to :
/afs/cern.ch/cms/beam_halo/ir1.lssl.6_4.pn274.sam
input.txt should be in the directory where you run cmsRun 


Added on February 25:
to run with the MARS files, you need a link for bgas.123 and tails.1,
in the directory where you run cmsRun.
The files are in /afs/cern.ch/cms/beam_halo/.