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Instrumentation

In this work UV-B radiation (280-320 nm) and ozone data from Brewer spetrophotomers are used. These spectrophotometers have been operated by INPE ­ the National Institute for Space Research of Brazil, since 1991 at Cuiabá and 1992 at Punta Arenas (Kirchhoff et  al., 1993; Kirchhoff et al., 1997). A full year of data, 1995, was used to anticorrelation study.