After {TAIL ~ pressures} in the first and second chambers stabilize, {HEAD ~ the pressures} are compared, and a leak warning signal is given if the compared pressures changed with respect to one another over time 
After are compared
After { TAIL ~ pressures } in the first and second chambers stabilize , { HEAD ~ the pressures } are compared , and a leak warning signal is given if the compared pressures changed with respect to one another over time
REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH