PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/18-21:58:00
G07     318.5          51.9               12.2 +/-    1.31      15.1 +/-    1.31  0.070 / 0.190
G08     118.8          47.4               14.0 +/-    0.47      18.2 +/-    0.47  0.100 / 0.220
G09     242.0          82.4               11.0 +/-    1.06      11.1 +/-    1.06  0.160 / 0.430
G16     43.8           16.2                8.0 +/-    1.29      19.2 +/-    1.29  0.150 / 0.530
G23     150.6          51.2               12.7 +/-    0.68      15.7 +/-    0.68  0.030 / 0.050
G27     65.4           35.4                9.6 +/-    0.83      15.1 +/-    0.83  0.040 / 0.060
G28     230.1          21.8               13.0 +/-    0.92      27.4 +/-    0.92  0.040 / 0.080
G30     295.9          31.9               11.1 +/-    0.89      18.7 +/-    0.89  0.060 / 0.080