{HEAD ~ The output signals} from transducer are then used by {TAIL ~ data processing unit} to compute the concentrations of propane, n butane gases and C5 + gases in the sample 
are used by
{ HEAD ~ The output signals } from transducer are then used by { TAIL ~ data processing unit } to compute the concentrations of propane , n butane gases and C5 + gases in the sample
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH