Flux sensors generate {HEAD ~ signal variations} corresponding to {TAIL ~ flux variations} as the forcer moves relative to the teeth of the platen 
corresponding to
Flux sensors generate { HEAD ~ signal variations } corresponding to { TAIL ~ flux variations } as the forcer moves relative to the teeth of the platen
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH