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