The subject image tracking, performed by mapping D into {HEAD ~ E} is represented by the relationship: ##EQU2## where Mult is a multiplicative constant, and {TAIL ~ Bias} is an additive constant 
The subject image tracking , performed by mapping D into { HEAD ~ E } is represented by the relationship : # # EQU2 # # where Mult is a multiplicative constant , and { TAIL ~ Bias } is an additive constant
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH