Examining FIG 6 in more detail, this figure is {TAIL ~ a simplified line representation} of {HEAD ~ the front} of a users head 200 as seen from the top 
Examining FIG 6 in more detail , this figure is { TAIL ~ a simplified line representation } of { HEAD ~ the front } of a users head 200 as seen from the top
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH