Corresponding FIG 5B illustrates {HEAD ~ the height} of the fiber optic pair from {TAIL ~ the surface} of the object being measured 
Corresponding FIG 5B illustrates { HEAD ~ the height } of the fiber optic pair from { TAIL ~ the surface } of the object being measured
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH