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