PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-16:28:00
G02     205.4          37.1               12.5 +/-    1.07      19.2 +/-    1.07  0.060 / 0.090
G06     150.4          73.9               11.8 +/-    0.92      12.2 +/-    0.92  0.060 / 0.090
G12     310.6          19.6                9.8 +/-    1.32      21.8 +/-    1.32  0.100 / 0.190
G17     43.0           43.4                9.1 +/-    0.50      12.6 +/-    0.50  0.110 / 0.240
G19     15.7           60.9                9.6 +/-    0.37      10.8 +/-    0.37  0.030 / 0.040
G24     294.3          39.2                8.9 +/-    1.63      13.1 +/-    1.63  0.040 / 0.050
G28     107.6          27.5               10.2 +/-    2.37      18.8 +/-    2.37  0.030 / 0.030