{HEAD ~ The level} of energy absorbed from these two beams, as determined by the energy of the acoustic disturbance produced within 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  
{ HEAD ~ The level } of energy absorbed from these two beams , as determined by the energy of the acoustic disturbance produced within 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
HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH