myCLs.sort()
    myCLsHisto = rt.TH1D("ExpectedCLs_%s" %BoxName, 100, min(myCLs), max(myCLs))
    for thisCLs in myCLs: myCLsHisto.Fill(thisCLs)
        
    clExpectedTree = rt.TTree("clExpectedTree", "clExpectedTree")
    rt.gROOT.ProcessLine(
        "struct MyStruct{\
        Double_t m0;\
        Double_t m12;\
        Double_t CLexp;\
        Double_t CLexpPlus;\
        Double_t CLexpMinus;};")
    from ROOT import MyStruct

    s = MyStruct()
    clTree.Branch("m0", rt.AddressOf(s,"m0"),'m0/D')
    clTree.Branch("m12", rt.AddressOf(s,"m12"),'m12/D')
    clTree.Branch("CLexp_%s" %BoxName, rt.AddressOf(s,"CLexp"),'CLexp/D')
    clTree.Branch("CLexpPlus_%s" %BoxName, rt.AddressOf(s,"CLexpPlus"),'CLexpPlus/D')
    clTree.Branch("CLexpMinus_%s" %BoxName, rt.AddressOf(s,"CLexpMinus"),'CLexpMinus/D')

    s.m0 = m0
    s.m12 = m12
    s.CLexp, s.CLexpPlus, s.CLexpMinus = ComputeMedian(myCLsHisto)
    clExpectedTree.Fill()
    
    outFile = rt.TFile(fileName.split(".root")[0]+"_expected.root", "recreate")
    clExpectedTree.Fill()
    myCLsHisto.Fill()
    outFile.Close()