Corresponding author: P.M. Inness, Centre for Global Atmospheric Modelling, Department of Meteorology, University of Reading, Earley Gate, P.O. Box 243, Reading, U.K. RG6 6BB. Tel: +44 (0)118 9875123 x7521. Fax: +44 (0)118 9318316. email: pete@met.rdg.ac.uk.
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