{TAIL ~ Current} from this current source is applied to load resistor 176 coupled between the collector of {HEAD ~ transistor} 168 and ground 
{ TAIL ~ Current } from this current source is applied to load resistor 176 coupled between the collector of { HEAD ~ transistor } 168 and ground
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH