{TAIL ~ The read circuit} consists of three transistors connected in {HEAD ~ series}, which operate in the low signal mode in reading 
{ TAIL ~ The read circuit } consists of three transistors connected in { HEAD ~ series } , which operate in the low signal mode in reading
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH