The flap is held in 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 {HEAD ~ the drape} 
The flap is held in 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 { HEAD ~ the drape }
OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD