The flap is held in {HEAD ~ position} hanging over {TAIL ~ the reference edge} of the table by the weight of the unfolded stack of panels above the flap and by the rest of the drape 
hanging over
The flap is held in { HEAD ~ position } hanging over { TAIL ~ the reference edge } of the table by the weight of the unfolded stack of panels above the flap and by the rest of the drape
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL 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