Hi, I have events that I store in a TTree. Now multiple events in the tree points to the same calibration/geometry object and to the same history (events undergo multiple reconstruction,...) and to the same run header. Then, I do not want to repeat those informations in each event, but I want to refer to them. How may I do such things (e.g. I'm not sure a can refer to a specific element of an other tree or use global TRef) ? Thanks for any help, Mathieu Ribordy
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