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