Table 12. 2002 aerial abundance estimates (and its components) for each species within each NE OPAREA stratum. N = number of groups. S=average group size. sm= small groups (<=5), lg = large groups (>5). SL = leading and single portion of the track line. Trail = trailing portion of track line. Dup = sightings detected on both the leading and trailing portions of the track line, that is, duplicates sightings.