In some embodiments, {HEAD ~ synthesized pixels} that do not correspond to a body part may be given {TAIL ~ a different type} of index 
given
In some embodiments , { HEAD ~ synthesized pixels } that do not correspond to a body part may be given { TAIL ~ a different type } of index
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH