{HEAD ~ Another example} of {TAIL ~ improvement} in structure of an optical element is shown in FIG 11 
of
{ HEAD ~ Another example } of { TAIL ~ improvement } in structure of an optical element is shown in FIG 11
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH