PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-13:58:10
G01     107.7          25.2                8.3 +/-    1.93      16.2 +/-    1.93  0.030 / 0.020
G07     105.9          58.8                8.0 +/-    0.88       9.2 +/-    0.88  0.020 / 0.020
G08     41.9           20.2                6.6 +/-    2.31      14.5 +/-    2.31  0.030 / 0.030
G09     173.9          12.8                7.3 +/-    1.02      19.2 +/-    1.02  0.030 / 0.030
G11     89.0           42.6                8.2 +/-    0.88      11.5 +/-    0.88  0.090 / 0.110
G13     310.0          28.4                5.4 +/-    1.61       9.8 +/-    1.61  0.090 / 0.130
G17     205.5          37.3                8.5 +/-    0.99      13.0 +/-    0.99  0.100 / 0.110
G18     80.7           24.1                6.1 +/-    3.27      12.1 +/-    3.27  0.080 / 0.140
G28     316.3          60.8                6.0 +/-    0.63       6.8 +/-    0.63  0.080 / 0.100
G30     16.2           77.5                6.8 +/-    0.75       6.9 +/-    0.75  0.060 / 0.130