The orientation of these gaps in {TAIL ~ the back iron} are configured to achieve the desired operation of {HEAD ~ the design} 
The orientation of these gaps in { TAIL ~ the back iron } are configured to achieve the desired operation of { HEAD ~ the design }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD