int Main()
{    
    // Make a TTree
    // 
    TFile outRootFile("MYTREE.root_NEW", "RECREATE");
    TTree* myTree = new TTree("myTree", "SIMPLE"); 
    // myTree->GetCurrentFile()->cd();
    double tt_aValue(0.0);
    if (myTree)
    {
        myTree->Branch("aValue", &tt_aValue);
    }
    TH1D* h1ook = new TH1D("h1ook", "TESTING 1b", 200, -50.0, 50.0);
    
	for (int i = 0; i < 100; i++)
	{
		tt_aValue = (i%2 == 0) ? -10 : 10;
        myTree->Fill();

		h1ook->Fill(tt_aValue);
    }
    
    // Draw 
    //
    cout << "myTree: " << myTree << " #entries: " << myTree->GetEntries() << endl;
    
    TCanvas* mc = new TCanvas("mc", "Test", 1500, 500);
    mc->Divide(3, 1);
    
    mc->cd(1); 
    myTree->Draw("aValue");

    mc->cd(2); 
    TH1D* h1 = new TH1D("h1", "test 1", 200, -50.0, 50.0);    
    myTree->Draw("aValue >> h1");
    
    mc->cd(3); 
	h1ook->Draw();
    
    return 0;
}