[63] The authors thank A. M. Uralov and V. V. Evstafiev for their interest in the study and useful discussion and also S. V. Voeikov for his help in processing of the initial data. The work was supported by the Russian Foundation for Basic Research (project 03-05-64100) and also by the grant N 272.2003.5 of the State Support of the Leading Scientific Schools of the Russian Federation. We thank the staff of the Scripps Orbit and Permanent Array Center (SOPAC) for providing us with the used in this paper initial data of the global network of ground-based two-frequency GPS receivers.
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