In some embodiments, {HEAD ~ each optical element} also provides {TAIL ~ additional aberration correction} for its third optical field 
provides
In some embodiments , { HEAD ~ each optical element } also provides { TAIL ~ additional aberration correction } for its third optical field
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH