We thank Drs. Dongxiao Wang, J. Metzger, H. Hurlburt, P. Chu, and Mr. E. Bayler for helpful discussions. We also thank Dr. P. T. Shaw for bringing to our attention some recent relevant publications. Comments from two reviewers have helped to improve the manuscript. The altimetry data is downloaded from the Web page of the University of Texas, Center for Space Research. This work is supported by ONR, NSF, API/UW—Madison (ZL, HY), the Chinese NSF (HY, QL), and the Visiting Scholar Foundation of the Keylab at the University of Ministry of Education in China.
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