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