Int_t ValidateTrees() {
    TFile* f = new TFile("results.root");
    TTree* tt = (TTree*)f->Get("bTree");
    std::vector<double>* vv;
    tt->SetBranchAddress("doubleObservables", &vv);
    tt->GetEntry(0);
    (*vv).size();
    return 0;
}