TChain, TString, Draw question

Hi experts!
I’m studying root by copying and pasting now. But there are parts i don’t understand in this code.

I don’t know the role of TString, and in Draw class what is the role of C2_noise+C1_HE part in ch->Draw(“>>h_C2”,C2_noise+C1_HE).
And also ch->Draw(“>>+h_C2”,C2_noise+C1_HE) why the ‘+’ is added front of the h_C2?

And this is the result.
Screenshot from 2021-07-01 01-23-59


Thanks! It really helps me.

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