Referring to FIG 10, it is preferable to orient the ellipse in {HEAD ~ the horizontal axis} relative to {TAIL ~ the eye} 
relative to
Referring to FIG 10 , it is preferable to orient the ellipse in { HEAD ~ the horizontal axis } relative to { TAIL ~ the eye }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL