FIG 4 shows a matrix of {HEAD ~ exemplary corresponding segment keys} 400 for {TAIL ~ the quality layers} 106, 108, 110, 112 of the exemplary SMLFE stream 100 
FIG 4 shows a matrix of { HEAD ~ exemplary corresponding segment keys } 400 for { TAIL ~ the quality layers } 106 , 108 , 110 , 112 of the exemplary SMLFE stream 100
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH