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