Flight-track O3 data averaged over
800-m vertical intervals for the first flight track
(0708-0805 CDT) on July 12: (a) lower level from
400 to 1200 m asl, and (b) upper level from 1200
to 2000 asl. Trajectory in Plate 5a was calculated
from mean winds in the 800 m layer from 400 to
1200 m asl.