{
  TCanvas *c1 = new TCanvas("c1", "c1",80,80,500,500);
  FILE *fp=fopen("data.dat","r");
  TFile *f=new TFile("data.root","RECREATE");
  TTree *t=new TTree("T","data from ascii file");
  Float_t x[8][3];
  t.Branch("x",x,"x[8][3]/F");

  
  UShort_t i,j,r;
  for(r=0;r<2000;r++)
    {
      for(i=0;i<8;i++)
        {
          for(j=0;j<3;j++) 
	    {
              fscanf(fp,"%f",&x[i][j]);
	       printf("%.3f ",x[i][j]);
            }
         }

      printf("\n");
     
      t->Fill();
   }
  for(i=0;i<1;i++)
   {
     t->Draw("x[i][1]:x[i][2]:x[i][0]",i);
 
   }

  //t->Draw("x[1][1]:x[1][2]:x[1][0]","","same");
  //t->Draw("x[2][1]:x[2][2]:x[2][0]","","same");
  //t->Draw("x[3][1]:x[3][2]:x[3][0]","","same");
  //t->Draw("x[4][1]:x[4][2]:x[4][0]","","same");
  //t->Draw("x[5][1]:x[5][2]:x[5][0]","","same");
  //t->Draw("x[6][1]:x[6][2]:x[6][0]","","same");
 // t->Draw("x[7][1]:x[7][2]:x[7][0]","","same");
 // t->Draw("x[8][1]:x[8][2]:x[8][0]","","same");
}