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