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