The authors wish to thank the U.K. Meteorological Office for supplying the 100-hPa temperature forecast and analysis fields from the ECMWF model, and also the TOMS ozone processing team for making their data so readily available. We are grateful also to Dr. S. Leonard, who provided valuable assistance with data manipulation and other computing problems. Very useful discussions with Prof. J. Stanford are gratefully acknowledged, as are the comments of an anonymous referee. The early stages of this work were carried out within a project funded by the U.K. Overseas Development Agency, which was concerned with ozone forecasting over southern Chile. Their support for the work is gratefully acknowledged.
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