A typical curve of {HEAD ~ α} as a function of {TAIL ~ the BIS value} is depicted in FIG 4 
A typical curve of { HEAD ~ α } as a function of { TAIL ~ the BIS value } is depicted in FIG 4
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH