{
   FILE *fpm = fopen("kpt.txt", "r");

   int i=0;
   double a,b,c,d;

   TGraph *ab = new TGraph();
   TGraph *cd = new TGraph();

   while (fscanf(fpm, "%lf\t%lf\t%lf\t%lf", &a, &b, &c,&d)!=EOF) {
      i++;
      ab->SetPoint(i,a,b);
      cd->SetPoint(i,c,d);
   }
   ab->Draw("al");
}