The method 1, further comprising emitting said flame {HEAD ~ wherein the point} of exit of the flame taken perpendicular to {TAIL ~ the longitudinal axis} of the flow of the flame is essentially non circular 
The method 1 , further comprising emitting said flame { HEAD ~ wherein the point } of exit of the flame taken perpendicular to { TAIL ~ the longitudinal axis } of the flow of the flame is essentially non circular
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH