Smoothing curve without over smoothing

[ssol]

Hello,
I am trying to plot the bin contents of TH1F using the Draw(“C”) option. But it looks like curve doesn’t represent the contents correctly. I have 6 bins and except for the first two bin entries, none of the other contents are above 0.5 but that is not what is shown by the curve. I would like to draw something similar to the plot shown on slide #35. That plot has more bins but I have only a few. I want the curve to show the entries correctly and the bin edges to be identified more clearly.

My code is given below and the plot obtained is attached.

Also, I am manually adding the position of the TLatex at the moment. How can I fix it to appear above the TLines so that if I change the Y axis, the TLatex entries still appear above the lines?

Thanks in advance for your help!

void plot(){

gStyle->SetOptTitle(0);

int nBins = 6;
float xEdges[7] = {100., 180., 230., 280., 350., 500., 800.};
float pvalues[6] = {0.7841, 0.5756, 0.2115, 0.0002855, 0.06586, 0.2903};

TCanvas *c1 = new TCanvas("nc1","",900,700);
TH1F *hist = new TH1F ("histpvalues","",nBins,xEdges);

for(int i=1;i<=nBins;i++){
   hist->SetBinContent(i,pvalues[i-1]);
}
hist->GetYaxis()->SetTitle("p-value");
hist->GetXaxis()->SetTitle("m [GeV]");
hist->SetMaximum(1);
hist->SetMinimum(10e-6);
hist->Draw("C");

TLatex *tl = new TLatex();
tl->SetNDC();
//tl->SetTextFont(32);
tl->SetTextColor(kRed);
tl->SetTextSize(0.032);
tl->SetTextAlign(12);

tl->DrawLatex(0.85,0.88,"0#sigma");
tl->DrawLatex(0.85,0.80,"1#sigma");
tl->DrawLatex(0.85,0.67,"2#sigma");
tl->DrawLatex(0.85,0.475,"3#sigma");
tl->DrawLatex(0.85,0.218,"4#sigma");

TLine *line0 = new TLine(100,0.5,800,0.5);
   line0->SetLineWidth(2);
   line0->SetLineColor(kRed);
   line0->SetLineStyle(7);

TLine *line1 = new TLine(100,0.158655,800,0.158655);
   line1->SetLineWidth(2);
   line1->SetLineColor(kRed);
   line1->SetLineStyle(7);

TLine *line2 = new TLine(100,0.0227501,800,0.0227501);
   line2->SetLineWidth(2);
   line2->SetLineColor(kRed);
   line2->SetLineStyle(7);

TLine *line3 = new TLine(100,0.0013499,800,0.0013499);
   line3->SetLineWidth(2);
   line3->SetLineColor(kRed);
   line3->SetLineStyle(7);

TLine *line4 = new TLine(100,3.16713e-05,800,3.16713e-05);
   line4->SetLineWidth(2);
   line4->SetLineColor(kRed);
   line4->SetLineStyle(7);



c1->SetLogy();
line0->Draw("same");
line1->Draw("same");
line2->Draw("same");
line3->Draw("same");
line4->Draw("same");
gPad->RedrawAxis();
}

[couet]

@ssol

TH1F using the Draw(“C”)

When you do not have enough points (bins) the smoothing algorithm may produce this kind of effect. Use Option “L” instead. Also note that the “same” option is not a TLine drawing option. Instead simply do: line->Draw();