TChain, TString, Draw question

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

Screenshot from 2021-07-01 01-09-37
Screenshot from 2021-07-01 01-09-37757×355 146 KB

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(“crystal2.energy>>h_C2”,C2_noise+C1_HE).
And also ch->Draw(“crystal2.energy>>+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

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TTree::Draw

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Thanks! It really helps me.

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