I have a bunch of root files which contain both histogram and tree objects. I know there is a HOW TO to merge the root files together but there are several reasons I do not want to merge the root files together (file can get pretty huge.) On the other hand, TChain can chain the tree objects from the different files together. I don't think TChain does anything to the histogram, am I right? I find that it would also be desirable to chain the histogram objects as well, i.e. adding the histogram. I don't know how feasible it is to do or is it a desirable feature to have? Aside: I was trying to bypass this problem by trying to write the histogram and tree to separate root file in the same program. This way, I can merge the histogram files and chain the tree files. But I was not successful. Does anyone know how to do this? Seng
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