{HEAD ~ Curves} 72 and 74 terminate at {TAIL ~ points} 83 and 84, their respective intersections with axes 80 and 79 respectively 
terminate at
{ HEAD ~ Curves } 72 and 74 terminate at { TAIL ~ points } 83 and 84 , their respective intersections with axes 80 and 79 respectively
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH