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