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