The amplitude of the output of {TAIL ~ receiver} 24 is sampled by {HEAD ~ sample/hold circuit} 171 
The amplitude of the output of { TAIL ~ receiver } 24 is sampled by { HEAD ~ sample / hold circuit } 171
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH