PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-14:12:40
G01     108.1          24.7                9.7 +/-    0.91      19.1 +/-    0.91  0.030 / 0.050
G07     106.7          55.8               10.4 +/-    0.93      12.2 +/-    0.93  0.030 / 0.040
G08     41.9           19.7                6.9 +/-    0.74      15.2 +/-    0.74  0.090 / 0.150
G09     173.9          13.4                9.3 +/-    1.35      24.0 +/-    1.35  0.080 / 0.150
G11     87.9           40.6               10.1 +/-    0.66      14.5 +/-    0.66  0.030 / 0.030
G13     312.0          26.1                6.5 +/-    1.23      12.3 +/-    1.23  0.030 / 0.030
G17     204.6          39.0               10.3 +/-    1.88      15.2 +/-    1.88  0.050 / 0.090
G19     208.4          13.4                7.9 +/-    1.39      20.4 +/-    1.39  0.040 / 0.080
G28     315.4          60.5                9.6 +/-    0.67      10.9 +/-    0.67  0.070 / 0.240
G30     7.8            75.9               10.1 +/-    0.51      10.4 +/-    0.51  0.080 / 0.210