This work was supported in part by Grants FAPESP-98/13397-400/02958-5 and CNPq-300223/93-7. Additional travel support was provided to I.W. by the Climate and Global Dynamics Division at NCAR. NCAR is sponsored by the National Science Foundation. I.W. thanks Peter Gent, R. Saravanan, and J. Tribbia for usefull discussions, and the FERRET support group and Andy Roberston for the SSA-MTM toolkit reference. I.W. would also like to thank Norberto Garcia for the Parana River data. S.A.V. is grateful to the Danish National Research Foundation for its support of this work. Constructive comments and suggestions from two anonymous reviewers are gratefully acknowledged.
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