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