{HEAD ~ Various alternative embodiments} are used to improve {TAIL ~ the efficiency} of the head by channelling the magnetic flux outside the gap 
are used to improve
{ HEAD ~ Various alternative embodiments } are used to improve { TAIL ~ the efficiency } of the head by channelling the magnetic flux outside the gap
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH