The flow leaving {TAIL ~ the calibration circuit} 144 is coupled to the purge line 154 by {HEAD ~ a calibration circuit outlet line} 146 
The flow leaving { TAIL ~ the calibration circuit } 144 is coupled to the purge line 154 by { HEAD ~ a calibration circuit outlet line } 146
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH