When reading information ntuple program file with the root (root-l root_script.cxx), you require this type of drawing scripts. Enter to store information .root file, remove the leaf information specified under the tree, painted on a one-dimensional histogram, adjust the cut, the graphical comparison between different input to see whether reasonable changes in pattern shape, and then solve the problem. Note: This program more practical in related fields, the basic things are easy to understand, thereby getting started, learn by analogy.

root_script.cxx

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