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