The operational amplifiers are {HEAD ~ a pre drive} to the pass transistors to allow {TAIL ~ smaller sense resistors} to be used 
The operational amplifiers are { HEAD ~ a pre drive } to the pass transistors to allow { TAIL ~ smaller sense resistors } to be used
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH