The adjustment may be performed by adjusting {HEAD ~ the force} exerted on {TAIL ~ a membrane}, which has been inserted in a wall of the reference cell 
exerted on
The adjustment may be performed by adjusting { HEAD ~ the force } exerted on { TAIL ~ a membrane } , which has been inserted in a wall of the reference cell
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH