FIG 7 shows {HEAD ~ the breakaway edge} already discussed, which is formed at {TAIL ~ the burner outlet} 
is formed at
FIG 7 shows { HEAD ~ the breakaway edge } already discussed , which is formed at { TAIL ~ the burner outlet }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL