def FakeEff(in_mean, in_sigma):
    in_func = F1("TMath::Gaus(x,{},{},true)".format(in_mean, in_sigma), 0, 100)
    resolution = Hist(50, 0, 100)
    n_events = 20000000
    resolution.FillRandom(in_func.name, n_events)
    resolution.Scale(1. / n_events)
    hist = resolution.GetCumulative()
    return hist
        def make_plot(raw_data, binning, title_text, outfn):
            h = Hist(*binning,
                     drawstyle='hist e1',
                     color=sigCOLORS[0],
                     linewidth=2,
                     title=';Percent difference[%];Events')
            for sample, value in raw_data.items():
                h.Fill(value['variation'], value['count'])
            hc = asrootpy(h.GetCumulative())
            hc.linecolor = 'gold'
            hc.fillcolor = 'lightyellow'
            hc.fillstyle = 'solid'
            hc.scale(h.max(include_error=True) / hc.max())
            xmin_, xmax_, ymin_, ymax_ = get_limits([h, hc])
            draw([hc, h], ylimits=(0, ymax_))

            x95, x99 = None, None
            cumsum = 0
            for i in range(1, h.GetNbinsX() + 1):
                cumsum += h.GetBinContent(i)
                if x95 is None and cumsum / h.Integral() > 0.95:
                    x95 = h.GetXaxis().GetBinUpEdge(i)
                if x99 is None and cumsum / h.Integral() > 0.99:
                    x99 = h.GetXaxis().GetBinUpEdge(i)

            title = TitleAsLatex(title_text)
            title.Draw()

            # print(title_text, ROOT.gPad.GetUymax(), hc.max())
            # draw a second axis on the right.
            ROOT.gPad.SetTicks(
                1, 0
            )  # Draw top ticks but not right ticks (https://root.cern.ch/root/roottalk/roottalk99/2908.html)
            low, high = 0, ROOT.gPad.GetUymax() / hc.max()
            raxis = ROOT.TGaxis(ROOT.gPad.GetUxmax(), ROOT.gPad.GetUymin(),
                                ROOT.gPad.GetUxmax(), ROOT.gPad.GetUymax(),
                                low, high, 510, "+L")
            raxis.SetLabelSize(0.03)
            raxis.SetLabelFont(42)
            raxis.SetLabelColor(convert_color('gold', 'root'))
            raxis.Draw()

            frame = canvas.FindObject('TFrame')
            lo, hi = frame.GetY1(), frame.GetY2()
            l95 = ROOT.TLine(x95, lo, x95, hi)
            l95.SetLineStyle(2)
            l95.SetLineColor(convert_color(sigCOLORS[1], 'root'))
            l95.SetLineWidth(2)
            l95.Draw()
            l99 = ROOT.TLine(x99, lo, x99, hi)
            l99.SetLineStyle(3)
            l99.SetLineColor(convert_color(sigCOLORS[2], 'root'))
            l99.Draw()

            leg = Legend(3,
                         margin=0.25,
                         leftmargin=0.45,
                         topmargin=0.02,
                         entrysep=0.01,
                         entryheight=0.02,
                         textsize=10)
            leg.AddEntry(hc, label='cumulative (norm.)', style='LF')
            leg.AddEntry(l95, label='95% @ {}'.format(x95), style='L')
            leg.AddEntry(l99, label='99% @ {}'.format(x99), style='L')
            leg.Draw()

            canvas.SaveAs(outfn)
            canvas.clear()