Hi Philippe, Sorry to bother you again but I have another funny behaviour. I do the following: 1. Open a chain 2. Attach _2_ files 3. Attach a split branch 4. Get event 3 -> works 5. Get event 4 -> works 6. chain->GetEntries() 7. Get event 3 -> Event is not read The same works if only _one_ file is attached to the branch, or the branch is _not_split_. Certainly I expect GetEntries() to not disrupt reading of branches, event if they are written in split mode. At least there are no warnings in the documentation of TTree. Cheers, Birger It follows the transcript of the session: ******************************************* * * * W E L C O M E to R O O T * * * * Version 3.05/05 8 May 2003 * * * * You are welcome to visit our Web site * * http://root.cern.ch * * * ******************************************* FreeType Engine v2.1.3 used to render TrueType fonts. Compiled for linux with thread support. CINT/ROOT C/C++ Interpreter version 5.15.86, Apr 29 2003 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. root [0] gSystem.Load("/afs/cern.ch/user/k/koblitz/public/h4/rawroot/Linux/libRawEvent.so"); root [1] TChain *inputChain = new TChain("T13","H4 Analyis Input Chain"); root [2] inputChain->Add("/coda/data/ecs63137"); root [3] inputChain->Add("/coda/data/ecs63138"); root [4] inputChain->SetBranchStatus("*",0); root [5] inputChain->SetBranchStatus("BRawHeader",1); root [6] inputChain->SetBranchStatus("fEvtNum",1); root [7] b_header=inputChain->GetBranch("BRawHeader"); root [8] TRawHeader *header=0; root [9] b_header->SetAddress(&header); root [10] inputChain->GetEntry(3) <---- Event 3 end TRawTdcInfo::Init() end TRawTdcInfo::Init() end TRawTdcInfo::Init() TRawTower constructor TRawTower constructor (Int_t)4 root [11] header->Print() fBurstNum = 0 fEvtNum = 3 <---- OK root [12] inputChain->GetEntry(4) <----Event 4 (Int_t)4 root [13] header->Print() fBurstNum = 0 fEvtNum = 4 root [14] inputChain->GetEntries() <---- GetEntries() (const Double_t)2.00000000000000000e+03 root [15] inputChain->GetEntry(3) <---- Event 3 end TRawTdcInfo::Init() TRawTower constructor (Int_t)4 root [16] header->Print() fBurstNum = 0 fEvtNum = 4 <----- OOOPS
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