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