anchor.diff:       write(*,'(" Output: ", A)') trim(output_file)
        write(*,*) repeat('-',60)
     end if
  -
  -  ! Start up multi-processing if needed
  -  call mp_initialize()
   
     ! SETUP
   
  
positive.code:      stop "Usage: bin/rt input_file output_file"
    end if
  
    if(main_process()) then
       write(*,*) repeat('-',60)
       write(*,'(" Started on ",A)') trim(now())
  
negative.code:   end if
  
    ! Display message
    if(main_process()) write(*,'(" [main] starting final iteration")')
  
    ! Do the RT
    if(use_exact_nu) then
  