{
   gROOT->ProcessLine(".L myvar.cpp");
   gROOT->ProcessLine(".L skim_athena.C");
   TChain *c1=new TChain("mytree");

  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.01.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.02.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.03.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.04.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.05.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.06.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.07.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.08.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.09.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.10.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.11.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.12.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.13.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.14.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.15.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.16.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.17.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.18.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.19.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.20.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.21.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.22.root");
  c1->Add("/rooms/sidious/higgs/alstone/em1trk/skimming/pass2_em1trk_skim.23.root");

   skim_athena p1(c1);
   p1.analyze("pass2_em1trk_tight_electron.root");
}