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