print "2016 with 2018: ", h_signal_2016.Chi2Test(h_signal_2018, "WW")
print "2017 with 2018: ", h_signal_2017.Chi2Test(h_signal_2018, "WW")
h_ratio_hists["h_ratio_2016_2017"] = copy.deepcopy(h_signal_2016)
h_ratio_hists["h_ratio_2016_2018"] = copy.deepcopy(h_signal_2016)
h_ratio_hists["h_ratio_2017_2018"] = copy.deepcopy(h_signal_2017)
gStyle.SetOptStat(0)
canvas_years = TCanvas()
pad1 = TPad("pad_main_plot", "", 0, 0.28, 1, 1.)
pad2 = TPad("pad_ratio_plot", "", 0, 0.01, 1, 0.27)
pad1.SetTopMargin(0.047)
pad1.SetBottomMargin(0.02)
pad1.SetBorderMode(0)
pad1.SetBorderSize(0)
pad1.SetFrameBorderSize(0)
pad2.SetBorderSize(0)
pad2.SetFrameBorderSize(0)
pad2.SetBottomMargin(0.3)
pad2.SetBorderMode(0)
pad1.Draw()
pad2.Draw()
pad1.cd()
legend_years = TLegend(0.15, 0.7, 0.3, 0.95)
legend_years.SetHeader(" ")
legend_years.SetFillColor(0)
legend_years.SetBorderSize(0)
legend_years.SetLineColor(1)
legend_years.SetLineStyle(1)
legend_years.SetLineWidth(1)
