Making a TH2F plot taking data from a TTree and from a TH1F of a Root file

ROOT
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At the ROOT prompt, you need: .! del ...

22

Hello @Wile_E_Coyote I got

root [0] .! generatedSel* generatedSel*.*
"generatedSel*" non è riconosciuto come comando interno o esterno,
 un programma eseguibile o un file batch.

it means that generatedSel* isn’t an internal or external command or an executable or batch file

23

You need to actually request the deletion with the command del for Windows or rm for Linux:

# either
root [0] .! del generatedSel* generatedSel*.*
# or 
root [0] .! rm generatedSel* generatedSel*.*
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