That is to say {HEAD ~ model balancing} is provided in {TAIL ~ steady and unsteady operational states} 
is provided in
That is to say { HEAD ~ model balancing } is provided in { TAIL ~ steady and unsteady operational states }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL