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