Data values are acquired for a set of {HEAD ~ metrics} for {TAIL ~ the target} and each field web site 
for
Data values are acquired for a set of { HEAD ~ metrics } for { TAIL ~ the target } and each field web site
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH