Operation of the UVSIMN and this study were supported by the National Science Foundation's Office of Polar Programs via a subcontract to Biospherical Instruments Inc. from Raytheon Polar Services Company (RPSC). Extended thanks go to Vi Quang of BSI for assisting in data processing. Dobson measurements for South Pole and Barrow were retrieved from http://www.esrl.noaa.gov/gmd/ozwv/dobson/. TOMS Nimbus-7 total ozone data were accessed via the website http://toms.gsfc.nasa.gov/n7toms/n7_ovplist_a.html. We thank Ellsworth Dutton from NOAA for discussions regarding cloud effects at the South Pole.
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