Leaf

please how can i make a leaf contain a1,a2 and a3
and a1 contain aa1 and aa2

please i need your help

TFile f(“ht.root”,“recreate”);

TTree* mytree = new TTree(“mytree”,“Test Tree”);

TH1D* h = new TH1D(“h”,“h”,10,0,1);

Double_t values[5] = {0,0,0,0,0};

TBranch *b2 = mytree->Branch(“b2”,values, “a/D:b:c:d:e”);

values[0] = 10; values[3] = -3.14; values[2] = 3;

mytree->Fill();

f.Write();