anchor.diff:  
       case(41) ! RF Multipole
         ktrack(i) = 66
  +
       case(43) ! X Rotation
         ktrack(i) = 68
  +
       case(44) ! Y Rotation
         ktrack(i) = 69
  +
       case(45) ! S Rotation
         ktrack(i) = 70
   
  
positive.code: 
    nthinerr = 0
  #ifdef FLUKA
      napxto = 0
  #endif
    if(lbacktracking) call aperture_backTrackingInit
  
    if(ithick == 1) then
      if(idp == 0 .or. ition == 0) then
        write(lout,"(a)") ""
        write(lout,"(a)") "TRACKING> Starting Thick 4D Tracking"
        write(lout,"(a)") ""
  
negative.code: ! ================================================================================================ !
  !  F. Schmidt
  !  Created: 1999-02-03
  !  Added pair mapping: V.K. Berglyd Olsen
  ! ================================================================================================ !
  subroutine trackDistance
  
  