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