Dear Rooters, I have a little problem regarding merging files containig a tree. I tried using the code below and it works fine in my case. TChain ch("T"); ch.Add("file1.root"); ch.Add("file2.root"); ch.Add("file3.root"); ch.Merge("big.root"); Now, my problem is how can i merge these three files if each of them contains two or more trees? Say file1.root contains trees such as "T1","T2", and "T3". Similarly for file2.root and file3.root, they also contain the same number of trees. Dennis
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