{HEAD ~ The beam} then passes through {TAIL ~ mode matching means} 66 and into third amplifying state 80, where it is amplified again 
passes through
{ HEAD ~ The beam } then passes through { TAIL ~ mode matching means } 66 and into third amplifying state 80 , where it is amplified again
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH