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