I would I be willing to use a newer version of ROOT, if you can explain how it works clearly I am all ears as I am finding this a steep learning curve at the moment. Danilo, I have tried to use the rooteventselector command as you outlined above but seem to get a string of error messages, I don’t know if these are due to using an older version of ROOT? I have attached the error code if that makes sense. I have also attached the ROOT browser which I am seeing, to check that I am identifying the name of the tree correctly, as it does not seem to work. Is there another command I can use to try and extract 1 event from the tree?
