The level of {HEAD ~ energy} absorbed from these two beams, as determined by the energy of the acoustic disturbance produced within cell induces production of {TAIL ~ an electrical output signal} by transducer at levels proportional to the concentrations of the propane and n butane gases in cell  
The level of { HEAD ~ energy } absorbed from these two beams , as determined by the energy of the acoustic disturbance produced within cell induces production of { TAIL ~ an electrical output signal } by transducer at levels proportional to the concentrations of the propane and n butane gases in cell
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH