We wish to express our thanks to Jeff Anderson and Arnold Neumaier, who drew our attention to some of the referenced literature on climatic predictability and discriminant analysis, respectively. Jeff Anderson, Ruth Michaels, Thomas Müller, Arnold Neumaier, Heidi Swanson, and Jens Timmer carefully read drafts of this paper. We gratefully acknowledge their comments and criticism, which led to substantial improvements in the final version.
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