The COR is a direct measure of the resilience of {HEAD ~ a golf ball} at {TAIL ~ a particular inbound velocity} 
at
The COR is a direct measure of the resilience of { HEAD ~ a golf ball } at { TAIL ~ a particular inbound velocity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL