FIG 4 illustrates {HEAD ~ optical path lengths} of {TAIL ~ beam component} 233 and beam component 234 in LC based switching system 120 
of
FIG 4 illustrates { HEAD ~ optical path lengths } of { TAIL ~ beam component } 233 and beam component 234 in LC based switching system 120
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH