[63] The authors thank V. A. Medvedev for his interest to the work and fruitful discussion and also S. V. Voeykov for his help in the preliminary treating of the data. The work was supported by the Russian Foundation for Basic Research (project 05-05-64634), integration grant SB RAS-FEB RAS 3.24. We thank the staff of the Scripps Orbit and Permanent Array Center (SOPAC) for presentation of the used in the paper initial data of the global network of ground-based two-frequency GPS receivers.
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