{
  float zer_dim[10];
  float zer_ypos[7] = { 0. , 0. , 0. , 0. , 0. , 0. , 0. };
  float zer_zpos[7] = { 517.85 , 509.85 , 501.65 , 493.85 , 485.65 , 457.85 , 449.65 };
  float zer_dphi[7] = { 20. , 15. , 12. , 10. , 8.57 , 7.5 , 6.67 };
  float zer_rmin[7] = { 11.02 , 17.66 , 23.52 , 30.10 , 36.40 , 41.07 , 49.14 };
  float zer_dr[7] = { 7.05 , 6.39 , 7.15 , 7.04 , 7.23 , 9.09 , 10.03 };
  float pos_zbox[3] = { 0.0 , 0.0 , 481.0};
  int zer_medium = 2;

  zer_dim[3] = 2. ;
  zer_dim[4] = 0. ;
  zer_dim[7] = 2. ;

  for(int j=0;j<2;j++)
    {
      zer_dim[0] = 0. + j*180.;
      zer_dim[1] = 180.;
      for(int i=0;i<7;i++)
	  {
	    zer_dim[2] = 180./zer_dphi[i];
	    zer_dim[5] = zer_rmin[i];
	    zer_dim[6] = zer_rmin[i] + zer_dr[i];
	    zer_dim[8] = zer_rmin[i];
	    zer_dim[9] = zer_rmin[i] + zer_dr[i];

	    TGeoPcon *pgonzer = new TGeoPgon(zer_dim[0] , zer_dim[1] , int(zer_dim[2]) , int(zer_dim[3]) );
	    pgonzer->DefineSection( 0 , zer_dim[4] , zer_dim[5] , zer_dim[6] );
	    pgonzer->DefineSection( 1 , zer_dim[7] , zer_dim[8] , zer_dim[9] );
	    TGeoVolume *zere = new TGeoVolume("ZERE", pgonzer , medium[zer_medium-1]);
	    gGeoManager->SetVolumeAttribute("ZERE","seen",1);
	    gGeoManager->SetVolumeAttribute("ZERE","colo",15);  

	    if(j==0)
	      {
		ZBOX->AddNode(zere,i*10+j,new TGeoTranslation( 0. , zer_ypos[i] , zer_zpos[i]-pos_zbox[2] ));
	      }
	    if(j==1)
	      {	
		ZBOX->AddNode(zere,i*10+j,new TGeoTranslation( 0. , zer_ypos[i] , zer_zpos[i]-pos_zbox[2] ));
	      }

	  }
      
    }






}