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Figures generated at, and data retrieved from, the CDC Web site are in the public domain and may be downloaded freely. We appreciate acknowledgement of the NOAA-CIRES Climate Diagnostics Center in your use of the images and data. This may be done by including text such as: Image provided by the NOAA-CIRES Climate Diagnostics Center, Boulder, Colorado, from their Web site at http://www.cdc.noaa.gov/.