{TAIL ~ The melt and gaseous flow medium} is passed through a Laval nozzle at {HEAD ~ a supersonic speed} 
{ TAIL ~ The melt and gaseous flow medium } is passed through a Laval nozzle at { HEAD ~ a supersonic speed }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD