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