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