//Attempt to make a TGraph stacker macro
//Ian Connelly
//29 Feb 2012

tgraphstack(){
    
    TFile* f = new TFile("f_hist.root", "OPEN");
    
    TGraph* signal = (TGraph*)f->Get("scaled signal;1");
    TGraph* background = (TGraph*)f->Get("scaled background;1");
    TMultiGraph* multiG = new TMultiGraph("multiG", "multiG");
    
    TCanvas* c = new TCanvas("c","c", 2000, 2000);
    c->SetLogy();
    c->RangeAxis(-1,1,0,1000000);
    multiG->Add(background);
    multiG->Add(signal);
    //Interesting behaviour where TMultiGraph just sets the minimum y axis to 3 orders of magnitude less than the maximum point being plotted.
    //Using SetMinimum forces the minimum point to be fixed
    //Here use 1 because log(1) = 0
    multiG->SetMinimum(1);
    //Use Draw("AL") to say plot axis and line
    multiG->Draw("AL");
    //signal->Draw("AL");





return 0;
}