{HEAD ~ The online web site analysis tool processes web site metric data} that is already stored for {TAIL ~ a population} of web sites as a result of search engine operations 
is stored for
{ HEAD ~ The online web site analysis tool processes web site metric data } that is already stored for { TAIL ~ a population } of web sites as a result of search engine operations
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH