Fig. 4
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Station distributions of (a) IVS-R1 before 2011.0, (b) IVS-R4 before 2011.0, (c) IVS-R1 after 2011.0, and (d) IVS-R4 after 2011.0. The blue triangles represent the stations. The color of the baseline shows its working frequency calculated as n/nmax, where n is the working times of the baseline and nmax is the total observation number.
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