For each metric within the set of metrics, a best data value acquired for the metric from among all field web sites is assigned as {HEAD ~ a bounding data value} for {TAIL ~ the metric} 
for
For each metric within the set of metrics , a best data value acquired for the metric from among all field web sites is assigned as { HEAD ~ a bounding data value } for { TAIL ~ the metric }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL