In {HEAD ~ preparation} for {TAIL ~ use} of the flow cell, the base 11 may be fixed in position to a mounting ring on an optical breadboard 
for
In { HEAD ~ preparation } for { TAIL ~ use } of the flow cell , the base 11 may be fixed in position to a mounting ring on an optical breadboard
OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH