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