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Brian Cairns3 NASA Langley Research Center (LaRC), Hampton, Virginia, USA Science Systems and Applications, Inc. (SSAI), Hampton, Virginia, USA NASA Goddard Institute for Space Studies (GISS), New York, New York, USA Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York, USA SRON Netherlands Institute for Space Research, Niels Bohrweg 4, 2333 CA, Leiden, The Netherlands