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. 2015 Feb 9;5:8328. doi: 10.1038/srep08328

Figure 3. Visible satellite number at the four-system station GMSD on September 3, 2013 (GPS Time).

Figure 3

The satellite number of GPS, GLONASS, BeiDou, Galileo and the total satellite number are shown by red, green, pink, black and blue lines, respectively.