{HEAD ~ The control voltage} is selected in {TAIL ~ such a manner} that it is dependent on the size of return stroke in order to compensate the alteration in the return stroke 
is selected in
{ HEAD ~ The control voltage } is selected in { TAIL ~ such a manner } that it is dependent on the size of return stroke in order to compensate the alteration in the return stroke
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL 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