Root TBranch copy doubt

[couet]

There is several threads on this forum about this topics. For instance this one:

Copy branches from tree to tree

I have four files (Ci.root, i = 1,2,3,4) each with a single tree called Ci. These trees each contain only a single branch (called ampl) of std:: objects. The way that these files are produced, they have identical numbers of entries (indeed, the same-numbered entries in each tree are from the same physical event). I would like a short program that can combine the ampl branches from the four trees into different branches of a single tree, in a single file. This could be by adding branches to o…

Do a simple search “copy branch” in the search field of the forum and you will get more.