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