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