The temperature independent voltage across {TAIL ~ the common resistor} and {HEAD ~ the base emitter junction} of the second transistor is buffered by a unity gain amplifier 
The temperature independent voltage across { TAIL ~ the common resistor } and { HEAD ~ the base emitter junction } of the second transistor is buffered by a unity gain amplifier
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH