performing a similarity measurement between the speaker identity candidate match scores and {HEAD ~ probe match scores} to obtain {TAIL ~ similarity values}; and 
to obtain
performing a similarity measurement between the speaker identity candidate match scores and { HEAD ~ probe match scores } to obtain { TAIL ~ similarity values } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH