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Acknowledgements

We like to thanks the members of the Laboratory for Atmospheres, Goddard Space Flight Center/NASA, for the fruitful discussions concerning different aspects of the present work during the visit to this laboratory and the TOMS Science Team Meetings. Also to all members of the ground based network working hardly in severe conditions mainly in Antarctica, to Dr. Marcos Machado of National Space Commission on Space Activities of Argentina and COSPAR, for his continuous support to this work and the following institutions for partial financial support: ANPCyT (Agencia Nacional de Promoción Científica y Tecnológica / National Agency for the Promotion of Scientific and Technological Research of Argentina), CONICET and National Universities of Rosario and San Luis. TOMS/NASA ozone satellite data where provided as part of the TOMS Science Team and GOME data from the corresponding Web site, with authorization. Both sources of data are kindly acknowledged. The technical computational assistance of Pablo García at the Astronomical Observatory of Rosario, Argentina, is kindly appreciated.

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