In FIG 4, the doors are shown open at the bottom and closed at {HEAD ~ the top} of {TAIL ~ the figure} 
of
In FIG 4 , the doors are shown open at the bottom and closed at { HEAD ~ the top } of { TAIL ~ the figure }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL