Figure 4. The ozone distribution in the tropical Pacific along the RV Vickers cruise trajectory during the CEPEX sampling period. The top panel shows CEPEX balloon soundings, while the bottom panel is based on output data from the MATCH control simulation (for times and locations corresponding to the balloon sonde launches). Note that the longitude axis also has an implicit time and latitude component, following the Vickers trajectory. The remarkable ozone minima which were observed during CEPEX are seen in the top panel; although similar minima are reproduced in the MATCH simulaion, ozone levels as low as those observed are not attained by the model in its present state of development.