The magnetic field within the duct is adjustable so that {HEAD ~ the emission} of {TAIL ~ the plasma} may be maximized 
of
The magnetic field within the duct is adjustable so that { HEAD ~ the emission } of { TAIL ~ the plasma } may be maximized
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH