{HEAD ~ The method} in {TAIL ~ accordance} 1, wherein said two excitation means comprise first and second coils, and said exciting substep comprises the further substep of: 
in
{ HEAD ~ The method } in { TAIL ~ accordance } 1 , wherein said two excitation means comprise first and second coils , and said exciting substep comprises the further substep of :
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH