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