Specifically, {HEAD ~ the receiving state table} defines {TAIL ~ the source} of picture data which each receiving device receives  
Specifically , { HEAD ~ the receiving state table } defines { TAIL ~ the source } of picture data which each receiving device receives
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH