We would like to express our gratitude to Dr. Jonas Nycander, Stockholm University, for valuable discussions and ideas during the preparation of this paper. We would also address our appreciations to the Swedish Meteorological and Hydrological Institute (SMHI) for allowing us to use their computer allocation at ECMWF. We also thank User Support, ECMWF, for their help with technical issues during the implementation of the breeding system.
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