Finding number of Muons

How can I find the number of Muons in my event. I see that in some ROOT tutorials, there is a branch called nMuons in the tree. However, when I look at my TTree I don’t see that I have the nMuon branch that tells me how many muons. What is the simplest way to find the number of muons generated?
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You should go back to the TTree creation program and add this variable.
If you are not the author of the TTree creation program check with the author.

The TTree I believe is created with my MadGraph simulation. I don’t see how to add it in my delphes card.

So you should go back to this simulation and ask the authors of this program.

Ok, I will check there. Thank you.

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