As a result, the average position of {HEAD ~ the stage} can be measured more accurately than any of {TAIL ~ its individual positions} 
As a result , the average position of { HEAD ~ the stage } can be measured more accurately than any of { TAIL ~ its individual positions }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL