Apparatus 1, wherein {HEAD ~ said third voltage} is applied to {TAIL ~ both said first and said second voltages} 
is applied to
Apparatus 1 , wherein { HEAD ~ said third voltage } is applied to { TAIL ~ both said first and said second voltages }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL