A summing resistor is connected across the two sense inputs, and coupling circuitry is operable to couple voltages appearing across {HEAD ~ the current sensing resistors} to {TAIL ~ the summing resistor} 
to
A summing resistor is connected across the two sense inputs , and coupling circuitry is operable to couple voltages appearing across { HEAD ~ the current sensing resistors } to { TAIL ~ the summing resistor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL