Basic question on how to read an histo, an ntuple etc. from a file

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• Previous message: James M White: "A few basic questions about RTTI facility and I/O via the TTree class"

I've a basic question:

after having converted an hbook file via the h2root.exe utility I want
to Draw the content of such file (it is made up of TH1Fs and TProfiles)
on the screen.
I've searched a bit in the tutorial but I still haven't understood well
how to find objects in a file (how can I know the content of an unknown
file??) and how to plot it.
Is there something useful in the tuotorial or elsewhere?

Thanks, Luca Sfarzo.

• Previous message: James M White: "A few basic questions about RTTI facility and I/O via the TTree class"