The absorption of the energy of {HEAD ~ the third laser beam} is also measured using {TAIL ~ photoacoustic methods} 
The absorption of the energy of { HEAD ~ the third laser beam } is also measured using { TAIL ~ photoacoustic methods }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL