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