based on the measurements obtained in step b, plotting the alcohol concentration levels for {HEAD ~ an individual} versus {TAIL ~ time} and using computerized techniques to obtain value of the Area Under the Curve for the ascending and descending parts of the plotted data 
versus
based on the measurements obtained in step b , plotting the alcohol concentration levels for { HEAD ~ an individual } versus { TAIL ~ time } and using computerized techniques to obtain value of the Area Under the Curve for the ascending and descending parts of the plotted data
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD 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