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