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