Under some circumstances a GMZI may drift the specified intensity or {HEAD ~ integrity} may change under {TAIL ~ a specific operational condition} 
Under some circumstances a GMZI may drift the specified intensity or { HEAD ~ integrity } may change under { TAIL ~ a specific operational condition }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL