Loop over root subdirectories

Dear experts,
I want to access the “lb_” sub_directories in the “run_340453” main directory of the file (1). so I wrote (2),
but it loop only over the main directory. Indeed I want a loop over the (lb_) in "run_340453/lb_". Do you see what is missing?
Regards

(1)
http://calpas.web.cern.ch/calpas/user.calpas.13356904.CombinedMonitoring._000135.root

(2)
http://calpas.web.cern.ch/calpas/sit_pileup.C

Dear experts,
sorry, I saw what was wrong.
Regards

For the information of other readers, please consider writing down your solution :slight_smile:
thanks.

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