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