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