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