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