import ROOT

ROOT.gROOT.ProcessLine(".x rootlogon.C") 
ROOT.gROOT.ProcessLine('gROOT->SetStyle("Plain")')

fname="outfiles/MC/sphere/drift_86.0/no_error/Cosmics_FopiMC_86ar85_1_recl.reco.root"

rfile=ROOT.TFile(fname,'read')
tree=rfile.Get('cbmsim')
tree.SetBranchStatus('*',0)

act_tree=['CutCosmics','DelTrack','TrackFitStat_0','TpcSPHit','TpcCluster']
for branch in act_tree:
    tree.SetBranchStatus(branch+'.*',1)


ev=-1
for e in tree:
    ev+=1
    print ev
    if ev>3:
        exit()