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