Because {HEAD ~ the beads} have a generally spherical surface, {TAIL ~ the radius} of curvature provides an additional distinguishing characteristic by which a particular sample may be identified 
Because { HEAD ~ the beads } have a generally spherical surface , { TAIL ~ the radius } of curvature provides an additional distinguishing characteristic by which a particular sample may be identified
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH