Is it possible for this peak photon count to show on the terminal?
You’re doing that in ROOT, right? You’re probably better off asking this in the ROOT discussion forums.
I asked, but no one was responding. This root file was generated in gean4. That’s why I am asking here.
There are functions in the ROOT TH1 class to let you extract the event counts in a bin, or even in a range of bins. See the ROOT documentation.
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