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