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Footnotes

1 University of Virginia, Dept. of Environmental Science, Charlottesville, Va. 22903.

2 National Center for Atmospheric Research (NCAR), Boulder, Colo. 80303. NCAR is operated by the University Corporation for Atmospheric Research and is funded by the National Science Foundation.

3 National Oceanic and Atmospheric Administration, Coral Gables, Florida 33124.

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