FIG 4 illustrates a graph representing distorted radii 405 as a function of {HEAD ~ the half view angle} compared with {TAIL ~ undistorted radii} 410 
compared with
FIG 4 illustrates a graph representing distorted radii 405 as a function of { HEAD ~ the half view angle } compared with { TAIL ~ undistorted radii } 410
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH