PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-10:28:00
G01     87.9           32.3                3.5 +/-    1.41       5.8 +/-    1.41  0.060 / 0.060
G07     127.4          43.0                4.6 +/-    0.87       6.4 +/-    0.87  0.050 / 0.040
G11     65.1           38.2                4.6 +/-    1.82       6.9 +/-    1.82  0.090 / 0.120
G13     291.9          36.9                7.6 +/-    1.98      11.6 +/-    1.98  0.110 / 0.120
G17     215.6          57.3                3.1 +/-    1.19       3.6 +/-    1.19  0.020 / 0.020
G18     60.4           22.7                3.5 +/-    2.29       7.3 +/-    2.29  0.040 / 0.020
G19     215.8          24.6                4.2 +/-    1.76       8.3 +/-    1.76  0.100 / 0.110
G28     350.9          61.7                5.1 +/-    0.64       5.7 +/-    0.64  0.080 / 0.140
G30     108.0          76.3                4.6 +/-    0.91       4.7 +/-    0.91  0.060 / 0.160