Optical fibers are held and aligned by {HEAD ~ means} of {TAIL ~ a base member} and a cover 
of
Optical fibers are held and aligned by { HEAD ~ means } of { TAIL ~ a base member } and a cover
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH