The bounding data values for {TAIL ~ the set} of metrics characterize {HEAD ~ the bounding web site} 
The bounding data values for { TAIL ~ the set } of metrics characterize { HEAD ~ the bounding web site }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD