I am wanting to know if there is an option for hadd so that it adds files together 1 entry per file and then the 2nd entry per file? I have 4 ntuples that I want to merge together but preferably I would like the 1st entry from each file merged and the then 2nd and then the 3rd and so on. This is so that I can run the resultant file through a BDT and train on events frm all of the 4 ntuples equally. Is this possible with hadd or is there another way to do this please?
Thanks
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