Leaf variable meaning and its unit

Dear ROOT experts,

I am not sure here is the right place to post this question?

I have one root file with one tree inside, and in this tree, there are many leaf variables, such as px, py, pz, E, etc. For some leaf variables, I can guess their meanings and their units (SI unit); however, there are some leaf variables that I cannot guess anything.

So, is there a way to explore the meaning of the leaf variable and its unit in the root file? (I mean any root files.)

Thanks in advance.

The meanings of leaves and their units are “defined” by the author(s) of these files. ROOT does not provide any default / standard method to store / retrieve this information in / from such files.

Hi!, @Wile_E_Coyote,

Thank you so much for your answer.

So, it seems that I need to ask the creator of this root file.
And there are no any commands inside root software to explore the meaning of the leaf variable and its unit. I am not sure that my understanding is correct or not?

Thanks, again.

The one who gave you these files should also provide you with a “precise description” of their contents.

Hi!, @Wile_E_Coyote,

Okay, I get it now.

Thanks a lot.