{
gSystem->Load("libCintex");
ROOT::Cintex::Cintex::Enable(); 
TFile f("cscreco_aod.pool.root");
TTree *CT = (TTree*)f->Get("CollectionTree");
hsum = new TH1F("hsum","Summed MET",100,0,400000);
CT->Draw( "MissingET_p1_MET_Final.m_source" );
CT->Draw( "MissingET_p1_MET_Final.m_etSum >> hsum" );
hsum->GetMean();
cout << " Mean of MET summed ET = " << hsum->GetMean();
hsum->GetRMS();
cout << " RMS of MET summed ET = " << hsum->GetRMS();
}