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