Moving the vent location to either side of the vent {HEAD ~ follower} causes {TAIL ~ fluid} or gas to escape from one or the other cell 
Moving the vent location to either side of the vent { HEAD ~ follower } causes { TAIL ~ fluid } or gas to escape from one or the other cell
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH