This work has been supported by EU-MAST Contract MERMAIDS (MAST-CT90-0039 and MAST2-CT93-0055). The first author was supported by EU-MAST Contract B/MAST 913005. This work was finished with partial support from a MATER contract (MAS3-CT96-0051) and the MFSPP EU-MAST project (MAS3-CT98-0171). We are grateful to Dr. A. Navarra and Dr. Hans von Storch for constructive discussions and critiques of the work.
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