PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-11:57:50
G01     128.8          10.1              -12.5 +/-   27.45     -34.7 +/-   27.45  0.030 / 0.020
G07     52.4           68.3                5.0 +/-    0.67       5.3 +/-    0.67  0.030 / 0.030
G08     51.5           39.7                3.9 +/-    1.28       5.8 +/-    1.28  0.070 / 0.080
G09     176.1          36.3                5.3 +/-    1.26       8.3 +/-    1.26  0.080 / 0.090
G11     118.2          32.8                4.0 +/-    1.08       6.6 +/-    1.08  0.030 / 0.030
G17     198.9          14.7                5.8 +/-    3.08      14.6 +/-    3.08  0.040 / 0.030
G23     161.1          11.5                4.1 +/-    1.60      11.0 +/-    1.60  0.130 / 0.250
G28     272.9          51.6                4.5 +/-    2.37       5.6 +/-    2.37  0.130 / 0.270
G30     328.0          56.6                3.7 +/-    0.61       4.3 +/-    0.61  0.170 / 0.290