{
   double x[100], y[100];
   int n = 20;
   for (int i=0;i<n;i++) {
     x[i] = i*0.1;
     y[i] = 10*sin(x[i]+0.2);
   }
   auto g = new TGraph(n,x,y);
   g->SetTitle("Graph title;X title;Y title");
   g->Draw("AC*");
}