The authors thank Drs. A. Navara, S. Gualdi, and T. Yamagata for kindly providing the SINTAX-F1 model data. This study was completed when CCH visited IPRC, University of Hawaii at Manoa. CCH was supported by NSC 95-211-M133-001-AP4 and NSC-96-2745-M-002. TL was supported by NSFC Grants 40628006/40675054 and ONR Grants N000140710145/N000140210532 and by the International Pacific Research Center, which is partially sponsored by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC).
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